Comet Enthusiast

manual telescope

	The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes List Price: $29.95 Sale Price: $29.95 Average Rating:
	This book tells how you can build a state-of-the-art Dobsonian telescope using readily available materials and supplies. Every step of construction is detailedin photographs and diagrams, and the underlying ideas are carefully explained...

What is the best electronic telescope?

I have a telescope that is in safe hand away because it was too sensitive and it was very difficult direct celestial objects. I want a telescope that is electronic so you can go to an object instead of having to get me myself! What are the best to get and what kind of price range I'm looking at ('s £). Thank you.

There are many cheap computerized telescopes to promise what you ask, but can not deliver. They are unstable saddles (which sounds like the problem with your telescope today), the inadequate and unreliable optical electronics. Telescopes cheapest computer I can recommend are the Intelliscope XT6i Orion Dobsonian (with digital setting circles) and the Celestron NexStar 6SE Schmidt-Cassegrain (fully Motorized Go). These areas still have a learning curve before they can "target" objects, but both do the job very well, and have an opening large enough that you will not be disappointed by what you see. I own both these areas and use both regularly. In the U.S. these areas sell for $ 400 and $ 800 respectively, so that should give you an idea of what it would cost in the United Kingdom

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

Meade LXD75 AR6 AT F8 Telescope Case Manual Extras    US $1,199.99

	99-07 FORD F250 SUPER DUTY MANUAL TELESCOPE MIRROR RH Sale Price: $95.55
	Partslink #: FO1321226 KOOL-VUE # FD79R OEM #: 3C3Z17682AAASKU #: AMZ-128-00626AR-FD79R-946070 Hollander #: 128-00626ARThis part will fit these makes and models with these options: right passengers_side1999 2000 2001 2002 2003 2004 2005 2006 2007 FORD SUPER DUTY PICKUP Manual, Telescopic Double-Swing Type, without Signal, RH Right

NEW PAIR SIDE VIEW DOOR MIRROR 99-07 FORD F250 SUPER DUTY MANUAL TELESCOPE Sale Price: $184.60

Partslink #: F350 PICKUP 99-07 ,Manual,Telescopic Double-Swing Type,without Signal FO1320226 & FO1321226 OEM #: 3C3Z17683AAA & 3C3Z17682AAASKU #: AMZ034-FD79L-FD79R-1 Hollander #: 128-00627AL & 128-00626ARThis part will fit these makes and models with these options: front_outside 1999 2000 2001 2002 2003 2004 2005 2006 2007 FORD SUPER DUTY PICKUP Manual, Telescopic Double-Swing Type, without Signal,

	99-07 FORD F250 SUPER DUTY MANUAL TELESCOPE MIRROR RIGHT Sale Price: $89.28
	Partslink #: 99-07 PICKUP BLK MAN FOLD RH 99-07 SUPER DUTY ONLY DUAL ARMS TELESCOPIC FO1321195 OEM #: 3C3Z17682AAASKU #: AMZ006-3334-4690R-1 Hollander #: 128-00626ARThis part will fit these makes and models with these options: right_outside passengers_side1999 2000 2001 2002 2003 2004 2005 2006 2007 FORD SUPER DUTY PICKUP Manual, Telescopic Double-Swing Type, without Signal, RH Right

	Turn Left at Orion: A Hundred Night Sky Objects to See in a Small Telescope--and How to Find Them List Price: $27.99 Sale Price: $15.90 Average Rating:
	Turn Left at Orion is a guidebook for beginning amateur astronomers, containing all the information needed to find over a hundred celestial objects. This revised edition includes tips on observing the upcoming transits of Venus and describes spectacular deep sky objects visible from the southern hemisphere...

	Binocular Highlights: 99 Celestial Sights for Binocular Users (Sky & Telescope Stargazing) List Price: $24.95 Sale Price: $13.50 Average Rating:

	The 100 Best Astrophotography Targets: A Monthly Guide for CCD Imaging with Amateur Telescopes (Patrick Moore's Practical Astronomy Series) List Price: $34.95 Sale Price: $21.57 Average Rating:
	Any amateur astronomer who is interested in astrophotography, particularly if just getting started, needs to know what objects are best for imaging in each month of the year. These are not necessarily the same objects that are the most spectacular or intriguing visually...

	The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes List Price: $29.95 Sale Price: $29.95 Average Rating:
	This book tells how you can build a state-of-the-art Dobsonian telescope using readily available materials and supplies. Every step of construction is detailedin photographs and diagrams, and the underlying ideas are carefully explained...

	The Year-Round Messier Marathon Field Guide: With Complete Maps, Charts and Tips to Guide You to Enjoying the Most Famous List of Deep-Sky Objects List Price: $24.95 Sale Price: $24.95 Average Rating:
	Among the deepest satisfactions of amateur astronomy is knowing your way around the sky. From the familiar guideposts of the brightest stars, you confidently point your binoculars or telescope toward the Andromeda galaxy, the Hercules cluster, or the Lagoon nebula...

	Photoshop Astronomy List Price: $39.95 Sale Price: $39.95 Average Rating:
	I remember my first one-day class on how to use Photoshop in 1997. During the long drive home I was excited by the possibilities of what I had seen a Photoshop Master accomplish. However, as I began work on my own images I had great difficulty implementing what I had learned...

manual telescope

telescope dobsonian

	Orion SkyQuest XT8 Classic Dobsonian Telescope List Price: $329.95 Sale Price: $329.95 Average Rating:
	Orion SkyQuest XT8 Classic Dobsonian Telescope

What is a Dobsonian telescope good for under $ 500?

I'm new to the hobby and am trying to avoid the typical mistakes that noobs. As I have read many of them come with a cooling fan .... Can anyone shed some light on why a light box would need a fan cooling?

This is a good price point. You have several ways to optimize, I'll explain. 1. I'm ruling out monitoring. At this price there is no alternative good for monitoring, including optics. 2. I am NOT ruling out a digital computer. It's great to have something to help you traverse the sky. 3. I'm considering that trafficking "With" things, especially the eye, are not always best. 4. I'm thinking about the new prices, but should REALLY consider buying used. Vi inch Astromart born 10 $ 300 not long ago and there is nothing better than that. In all cases I am recommending Orion compared to alternatives such as Hardin. Is recognized good name and best resale value (Astromart join, a fee of $ 12). People pay the money due in part to ebay is well known for scams and fraud: I saw an eBay tool for sale in Montreal, tried to give up and buy it and wear it, only to discover that the same exact instrument had been sold in England before, the same images, the description itself, everything. Shipping Orion (Orion directly) are quite high, so you can find a better price you get (on Orion products!) Highpoint of Science, so the first call. OK - Option 1. Throw everything you can cat a cube of light and use the coming "with" the eye until you get more cash. More people prefer the "get as much openness as possible approach." Orion XT8 classic will get you there. Option 2. Get the Orion XT6 place and make it with your computer. Option 3. Get the Orion Star Blast for $ 175 and a 24 mm eyepiece optics Pan for about $ 300. Sounds crazy spend more on the telescope eyepiece, but someday will update and you still have the eye. Pan da optics in this area (direct experience), 3.5 degree panoramic field of view that is well corrected. You will be able to get around, beautiful views that are better than most binoculars and easier certainly use (arms do not tire.) With the arrival "with" eye to achieve higher power, you get good views of the moon and "Reasonable" (Not first class) views of Jupiter and Saturn (which are only available a few months of the year in any case, Jupiter is so low for observers N hemisphere there is very little time to "optimize" for looking at this planet until two or three years from now - plenty of time to update Idem for Saturn, whose rings are moving in the edge-on). So this little room is help you learn to navigate and point of a scope under heaven. Be objected that "you can not see much" in a 4.5-inch scope. To this I respond that there are thousands of devotees who spend thousands of dollars in 80, 90 and 102 mm refractor. Personally I agree that it is best to open access, but the bottom of a small instrument are also evident: ease of installation, panoramic width fields, and in the case of the explosion the star, good quality packaging at a lower price. Try to get a new copy or used (abebooks.com), to Sue French Celestial Sampler. This book is basically designed for the opening of four inches, and there are years of observation to make on their pages. The sky known artist, Stephen O'Meara has also published the work with a four-inch telescope (His main instrument). A four-inch instrument will ALL Messiers and several thousand NGCs. As a final point, I'm not saying you should get a four-inch reach and maintain for the rest of your life and use that and only that. But in fact this is a very easy to decide if astronomy is for you. If you receive the error that will finally get something bigger (maybe keep the small, maybe not) and probably spend a regular budget to astronomy, as some people have a budget for the bowling. So there is no single configuration that you need to be bound for the rest of his life, and they all have something to show. Of course, you should also consult Sky and Telescope website for a club near you so you can see many different configurations on the job. You can see that says, "I have to have something." And I can not emphasize enough that, although many people are horrified the idea of spending $ 12 to join Astromart (a payment for life time), which could easily save $ 200 on your first purchase and if you get your feet wet you will not feel nervous about buying any particular field, because you know the place to sell if you decide to move on. Preserving the sense of flexibility is important.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

NEW MEADE 10 LightBridge TrussTube Dobsonian Telescope    US $639.00

10 f 56 Dobsonian Telescope with Koenig Eyepiece    US $62.27

FoldScope Twelve Inch Dobsonian Astronomical Telescope    US $3,300.00

Celestron FirstScope 76mm Dobsonian Telescope    US $44.95

Galileo DB 160 1300mm x 160mm Dobsonian Telescope    US $234.99

Rokinon Dobsonian Table top Telescope 300 x 76mm    US $59.99

Meade LightBridge Deluxe 16 Truss Dobsonian Telescope    US $1,849.00

14 DobSTUFF Dobsonian Telescope w many many extras    US $2,500.00

Galileo 500mm 80mm Dobsonian Reflector Telescope NEW    US $74.99

ORION SKYQUEST XT12 CLASSIC 12 DOBSONIAN TELESCOPE    US $449.99

Celestron FirstScope Dobsonian Reflector Telescope NEW    US $49.99

GALILEO DB 135 DOBSONIAN REFLECTOR TELESCOPE STAND    US $199.99

New 76mm Dobsonian Table top Telescope    US $59.99

Rokinon DB76 ViewStar Dobsonian Telescope NEW    US $99.95

20 inch Parabolic Dobsonian Telescope Primary Mirror    US $2,499.00

Bushnell DOB 6 Dobsonian Telescope OpticsPlanet    US $349.99

Celestron Dobsonian Reflector Telescope FREE STUFF    US $44.99

Meade 8 inch Truss Tube Dobsonian Telescope FREE SHIP    US $460.00

	Orion SkyQuest XT8 Classic Dobsonian Telescope List Price: $329.95 Sale Price: $329.95 Average Rating:
	Orion SkyQuest XT8 Classic Dobsonian Telescope

	The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes List Price: $29.95 Sale Price: $29.95 Average Rating:
	This book tells how you can build a state-of-the-art Dobsonian telescope using readily available materials and supplies. Every step of construction is detailedin photographs and diagrams, and the underlying ideas are carefully explained...

	Orion SkyQuest XT4.5 Classic Dobsonian Telescope List Price: $229.95 Sale Price: $229.95 Average Rating:
	Without spending a fortune you can get a telescope that will not only satisfy the kids, but the kid in you! Our SkyQuest XT4.5 is a quality telescope, with point-and-view simplicity that makes it easy to use and makes stargazing fun! The optical performance is far and away better than flimsy department store models...

	Orion SkyQuest XT8i IntelliScope Dobsonian Telescope with Object Locator List Price: $529.95 Average Rating:
	Orion's SkyQuest XT8i Intelliscope Dobsonian Computerized Telescope combines powerful 203mm-diameter reflector optics with point-and-view simplicity in a nicely portable package. With the included IntelliScope Computerized Object Locator, the amateur stargazer can pinpoint the location of 14,000+ celestial wonders stored in the IntelliScope's databank...

	Orion SkyQuest XT6i Computerized IntelliScope List Price: $399.95 Sale Price: $399.95 Average Rating:
	This remarkable scope combines powerful 150mm-diameter reflector optics with point-and-view simplicity in one nicely portable package. And with the included IntelliScope Computerized Object Locator, even the novice stargazer can pinpoint the location of 14,000+ celestial wonders stored in the IntelliScope's databank...

	Fun with telescopes List Price: $2.99
	Has The Night Sky Always Fascinated You Since You Were A Child? Do You Often Wonder What Lies Beyond The Dark Expanse Above? Do You Want To Fathom The Mysteries Of The Infinite Universe?At Last! A Guide That Explains Astronomy And Telescopes In Layman's Language, Leaving All The Technical Jargon Out! Understand The Basics Of Astronomy And Telescopes...

	Tom Swift and His Giant Telescope List Price: $3.55
	Tom Swift appeared to be calm, although in reality he was about as excited over his latest invention as he ever had been about anything in his life.

	Orion SkyQuest XT10 10" Classic Dobsonian List Price: $499.95 Sale Price: $499.95 Average Rating:
	Orion(r) SkyQuest(TM) XT Classic Dobsonians It's no wonder customers heap 5-star ratings on these "gentle giants." For not only do their jumbo-sized optics and uncomplicated design bring a "new level of joy to simple observing," raved Astronomy magazine, but they're also the most affordable quality Dobs on the market...

telescope dobsonian

telescope newtonian

Drops of Time Quantum 5

Summary

The theory of special relativity and quantum mechanics has its mysteries that overrides the common sense of people living in a world sprint or restrict to Newtonian physics. Some examples are also presented ..

Time Quantum Drops 5

The Mysteries of Relativity

Objects that decreases in length

According to the theory of relativity an object moving in the direction of movement length decreases as speed increases up to remove when it reaches the speed of light in a vacuum.

The mass of an object increases with speed

The increasing mass of a moving object, as speed gains to be infinite at the speed of light. The first experimental verification of this effect was presented at the Stanford Linear Accelerator (more than three miles long), in California, which accelerated electrons, already close to the speed of light was the increase of the mass of 40,000. Overall, a soccer ball that weighs about 450 grams from accelerating to full speed near the speed of light can weigh more than the Sun!

The rhythm of time of a body decreases with increasing speed

This effect of relativity is true also with increasing speed until the time stops completely when the body reaches the speed of light. This unusual phenomenon has given rise to the paradox twins: if a brother of a pair of twins make a trip in a spaceship near the speed of light, returning to Earth, would be younger than his brother who stayed here during the same time. This is not fiction. It is an effect of relativity has been verified experimentally. A high precision atomic clock in orbit Earth presents significant differences with respect to time of a clock synchronized with the same stationary on the ground. The science fiction film Planet of the Apes is no longer fiction in the future if man will travel at speeds near the speed of light. It should be remembered that the theory of relativity prohibits a body has the same speed of light, but the equation shows that the relativistic mass can exceed the speed of light, which would lead to unobserved particles to tákeons now in the journal Nature. That would allow travel into the past, leading to the grandfather paradox: a person can travel back in time and kill your grandfather, but if that happened she would not have born. Also the trip to the future could be through holes called wormholes would allow travel between parallel universes, if they exist. Time machines are feasible in unorthodox situations. Another example of the relativity of time is interplanetary communication. When man land on Mars centers space controllers on Earth will only receive the confirmation of the landing 20 minutes later, a 'hello' received from the astronaut in the Martian soil and is a past event, but for us it is present. When we look at the sky we are looking to the past. A star is not may no longer exist, what we see are the photons that come out of it for years, thousands of years, millions of years, or even billions of years in the case of a galaxy, quasar, or a neutron star, the black hole appears only indirect evidence. Space Telescope Hubble has photographed galaxies that are at the beginning of time, depending on the model of the Big Bang.

About the Author

Phisicist and writer. Five published books. Msc.  in science by COPPE-UFRJ (Rio de Janeiro). Phd in Physics by UFPA(Belém do Pará). Take training at Kernforschunganlage Jülich Gmbh-Germany. Professor and guide of two thesis in post-graduation. Flght-Controller. Articles published at journals. See more at Google search: "leopoldino dos santos Ferreira".

Suppose your Newtonian reflector telescope has a mirror 25 cm diameter target with a focal length of 2m

What increase with eye bags with focal legths of: a.) 9mm, b.) c. 20mm and 55mm)? What is the angular resolution of telescopes?

Magnification = lens focal length divided between the focal length of the eyepiece. 2m = 2.000 mm, so the 9mm eyepiece gives 2000 / 9 = 222 power, 20 mm gives 2000/20 = 100 gives power and 55mm 2000/55 = 36 power.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

Galileo 800mm 80mm Newtonian Reflector Telescope FS    US $129.94

New White 6 Newtonian Reflector Telescope w Tripod    US $229.99

CSTAR OPTICS 360 NEWTONIAN TELESCOPE GREAT DEAL    US $29.99

10 f 8 newtonian telescope RF Royce    US $800.00

NEW Celestron PowerSeeker 127 EQ Newtonian Telescope    US $149.95

Vixen R130Sf 130mm f 5 Newtonian Reflector Telescope    US $249.00

MEADE SCHMIDT NEWTONIAN TELESCOPE OTA 152MM    US $80.00

Celestron LCM114 Computerized Newtonian Telescope NEW    US $299.00

150 mm EQUATORIAL NEWTONIAN REFLECTOR TELESCOPE 2010    US $399.99

114 mm EQUATORIAL NEWTONIAN REFLECTOR TELESCOPE 2010    US $199.99

WHITE 6 NEWTONIAN REFLECTOR TELESCOPE TRIPOD NEW FREE    US $217.88

Celestron Telescope Newtonian 114mm 910mm focal length    US $129.99

Newtonian Reflecting telescope of Isaac Newton souvener    US $99.00

WHITE 6 NEWTONIAN REFLECTOR TELESCOPE TRIPOD NEW FREE    US $217.88

Edmund Scientific 6 Inch Newtonian Telescope    US $132.50

Tal 1 Russian made 43 Newtonian reflector telescope    US $639.59

SKY WATCHER GREATSTART 130N EQ2 NEWTONIAN REF TELESCOPE    US $118.89

	Celestron Collimation Tool (for Newtonians) List Price: $9.95 Sale Price: $3.75 Average Rating:
	The optical performance of most Newtonian telescopes can be optimized by collimating, or realigning, the telescope's optics, as needed. This procedure is easily accomplished with Celestron's Collimation Tool, a handy accessory that comes with detailed instructions.

	Bushnell Voyager Sky Tour 76mm Reflector Telescope List Price: $208.95 Sale Price: $110.00
	BUSHNELL 78 9930 Sky Tour Reflector Telescope 3" reflector telescope with audio hand set; Electronic hand set gives real time location of the night sky ; Illuminated mount works with the electronic hand for direction to the planets & the constellations ; 1...

	Galileo FS120DX 1000 x 120mm Newtonian Reflector Telescope List Price: $229.99 Sale Price: $199.95 Average Rating:
	The night's sky will be clear as day with the Galileo FS-120DX Reflector Telescope. It's the perfect balance. Finding a Telescope that is the perfect balance of magnifying power and light is a little tough...

	Orion SkyView Pro 8" EQ Reflector Telescope List Price: $649.95 Sale Price: $649.95 Average Rating:
	Prepare to be amazed with our SkyView Pro 8 EQ reflector. It's got a full 8" (203mm) parabolic primary mirror, which gathers 73% more light than a 6". Observe the Messier Catalog and a host of other deep-sky objects with the reach of this scope! And if you're into the Moon and planets, SkyView Pro 8's 1000mm focal length (f/5) gives you the appropriate image scale to resolve the finest detail...

	Swift 863R 4.5in. Newtonian Reflector Telescope Sale Price: $230.95
	The Swift 863R is a 114mm (4.5'') diameter, 900mm focal length Newtonian reflector telescope, with an equatorial mount, aluminum tripod, 5x20 finderscope, 6, 9 and 20mm Kellner 1.25'' eyepieces, for magnifications from 45-150x...

	Orion 203mm f/4.9 Reflector Telescope Tube Assembly with Crayford-Style Focuser List Price: $309.95 Sale Price: $309.95
	Responding to your requests, we are pleased to offer this reflector optical tube assembly (OTA) for folks who already have an equatorial mount. This optical tube assembly includes parabolic mirror optics, center marked for easy collimation...

telescope newtonian

Guidebook Manual

	The Guide for Guys: An Extremely Useful Manual for Old Boys and Young Men Sale Price: $9.95
	Michael Powell's The Guide For Guys comes loaded with helpful, sincere information for men in almost every situation. From "how to use a compass" to "ask for a raise" to "pitch a curveball," this guide will start any reader young or old on the right track...

Earth4Energy eBook - Learn How to harvest energy from the sun to run home

Solar energy is one of the cleanest sources of power that is practically free. No wonder solar energy demand has skyrocketed in recent years. The energy crisis coupled with a desire to reduce the footprint Carbon has made solar energy in the number of an alternative source of energy in the middle of homeowners.

The cost associated with a solar system installed by a professional can be very high, ranging from $ 10,000 to $ 50,000. Because of this, many homeowners have become DIY solar energy. A DIY, or Do-It-Yourself system Solar can be fun for thousands of dollars to build and cheaper than a solar system installed by a pro. If you want to go the DIY route, first thing you need is a High quality guide to walk you through the process of equipping your house with solar energy.

The Earth4Energy eBook is one of the most popular guides about making your own solar energy. Not just a hug eBook, filled with information also has video that cross, many walk every step detail involved in making your home energy efficient and environmentally friendly. The low initial cost of $ 49.97 makes it a very cost effective solution to solve their needs for clean energy.

The Earth4Energy eBook consists of several parts that deal with clean energy in general, and solar energy in particular. If you have been wondering about how solar energy works, or its advantages, is the Earth4Energy eBook to be quite helpful. After that, you can dive into the meat of the book - a step by step guide to making your own solar panels for solar energy use. While that may sound complicated, panels solar home are very easy to build, especially with the kind of easy to follow Earth4Energy outlines the steps.

Of course, some people may find written instructions a bit difficult to follow. Therefore, Earth4Energy also includes a comprehensive video course that details all the steps involved in building a solar power system.

As an added benefit, the Earth4Energy manual also has several parts devoted to wind energy and how harvest electricity. This bonus, along with detailed focus on solar energy to the Earth4Energy ebook one the best guides for harvesting energy from the sun in your backyard too.

To read the views of consumers and review visit Earth4Energy review this page.

About the Author

Earth4Energy manual review

Is there a website where I can see the Sims 3 book online guide for free?

I do not want to spend $ 20 for the complete guide for the game. They already have the manual, but I would like to look at the guide ... web anywhere?

These sites are very nice http://snootysims.com/forums/viewtopic.php?f=21&t=29573 http://sims.wikia.com Hope this helps:)

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

No items matching your keywords were found.

	A Speaker's Guidebook: Text and Reference Sale Price: $14.95 Average Rating:
	Public speaking is an essential skill both in the classroom and in public life. With thorough coverage, a unique tabbed and full-color format, and a low price, A Speaker's Guidebook is the most useful speech textbook available for students both in and outside of the speech classroom...

Learning through Serving: A Student Guidebook for Service-Learning Across the Disciplines List Price: $19.95 Sale Price: $17.78 Average Rating:

· A student-friendly, self-directed guide to service-learning· Develops the skills needed to succeed · Clearly links service-learning to the learning goals of the course· Combines self-study and peer-study workbook formats with activities that can be incorporated in class, to give teachers maximum flexibility in structuring their service-learning courses· Promotes independent and collaborative learning · Equally suitable for courses of a few weeks’ or a few months’ duration· Shows students how to assess progress and communicate end-results· Low priced–the ideal companion to disciplinary course readings· Methodology and activities extensively tested at Portland State University· Written for students participating in service-learning as a class, but also suitable for students working individually on a project This book is intended as a self-directed guide for college-level students who are engaged in service-learning...

	Route 66 Adventure Handbook: Expanded Third Edition (Route 66 Series) List Price: $16.95 Sale Price: $10.27 Average Rating:
	A guide to all the exuberance, splendor, and absurdity of Route 66, this reference includes details on the magnificent architecture, natural wonders, vintage motels and cafes, unique museums, offbeat attractions, fascinating artifacts and icons, and kitschy tourist traps that dot this famous stretch of road...

	US Marine Corp Guidebook of Essential Subjects Manual List Price: $14.99 Sale Price: $5.99 Average Rating:
	This is the United States Guidebook that teaches our soldiers the basics of war. Topics Include: Code of Conduct, Marine Corps History and Customs, Close Order Drill, Interior Guard, First Aid, Uniforms and Equipment, Physical Fitness, NBC Defense, Service Rifle & Marksmanship, Individual Tactical Measures, Security of Military Information, Substance Abuse, Land Navigation.

	The Guide for Guys: An Extremely Useful Manual for Old Boys and Young Men Sale Price: $9.95
	Michael Powell's The Guide For Guys comes loaded with helpful, sincere information for men in almost every situation. From "how to use a compass" to "ask for a raise" to "pitch a curveball," this guide will start any reader young or old on the right track...

	Arctic Cat Factory Service Manual / 2001 High Altitude Guidebook / Pt # 2256-354 Sale Price: $29.95
	Arctic Cat Genuine Service Manuals lead the industry with clear, comprehensive presentation of motorcycle service and repair procedures. Each Service Manual is model specific and contains easy to read text sections supported by top quality photography and illustrations...

	Arctic Cat Factory Service Manual / 2003 High Altitude Guidebook / Pt # 2256-803 Sale Price: $29.95
	Arctic Cat Genuine Service Manuals lead the industry with clear, comprehensive presentation of motorcycle service and repair procedures. Each Service Manual is model specific and contains easy to read text sections supported by top quality photography and illustrations...

	Arctic Cat Factory Service Manual / 2005 High Altitude Guidebook / Pt # 2257-158 Sale Price: $29.95
	Arctic Cat Genuine Service Manuals lead the industry with clear, comprehensive presentation of motorcycle service and repair procedures. Each Service Manual is model specific and contains easy to read text sections supported by top quality photography and illustrations...

Guidebook Manual

dobsonian telescopes for astronomy

How do you build a telescope? I need someone to check my answer..?

I am putting up a site called www.howtelescopeswork.com In it, I talk about tips on viewing astronomy, the moon, planets, etc. I have plans that I redrew for a dobsonian telescope, multiple truss tube sizes, building a laser collimator and even a camera barn door mount. I would like any feed back on this before I send it to the printers. I am releasing this because of the year of astronomy! Oh, and don't forget to hit some of the sponser links. This helps pay for the webspace I am using up!

The first thing I looked for isn't there (or I couldn't find it quickly): how to determine the sizes, prices, quality, supplier of your mirrors.

A site map, for easy reference, might be a good idea too.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

No items matching your keywords were found.

dobsonian telescopes for astronomy

Mount Tripod

	5 in Classic Nautical Sundial Compass in solid Brass List Price: $38.95 Sale Price: $32.58 Average Rating:
	This is a finely crafted, solid brass sundial and compass in one convenient unit. This unit allows an individual to tell the exact time by taking into account all local variables, a marker to account for the declination of the sun, a sundial, and a compass with a magnetic needle...

Tripod Alternatives for Photographers

Tripod Alternatives for Photographers

R. Dodge Woodson

Magnificent Monopods

Monopods may be one of the best inventions to come along for outdoor photographers. These stick-like supports do a super job, and they can be packed and carried with ease. Monopods are light in weight, don't take up much room, and can provide a very steady platform for your camera. Don't waste your money on cheap models. Buy a good quality monopod and enjoy it.

Monopods are great for photographers who are covering sporting events, capturing photos of wildlife, or focusing in on a final sunset. A one-legged support can't give you the rock-hard steady platform that a tripod can, but it will provide more than enough support for most types of shots. The big advantage to a monopod is that it is so easy to carry with you that it will be there when you need it, and a heavy tripod may not be.

Support Sacks

You can improve many aspects of your location photography by acquiring, or making, support sacks for your camera lens. These devices are available commercially, but they are also easy to make. What is a support sack? It is basically a bag that is filled with some type of moldable material that will conform to the shape of your camera lens. The filling could be styrofoam beads, buckshot, sand, kitty litter, foam rubber, or even pine needles. Since bags that are light in weight are more enjoyable to carry, I would stay away from sand and buckshot as a filler material.

The concept behind support sacks is simple. You place the sack on a solid object, like a rock or the edge of your vehicle, and then nestle the lens of your camera into the sack. Once the lens has settled into the material, you have a very sturdy support for your camera and lens. For a sack to work, you need something stable to place it on, and you are limited by the availability of such places. Another drawback to a sack is that you cannot adjust its height.

Every type of camera support has its own strong points. Sacks are great for photographers who are shooting from their vehicles or who want a low camera angle to capture something close to the ground or floor. This type of support won't do you a lot of good at the zoo or while taking wedding pictures, but there are many times when a support sack is just the right tool for a steady picture.

Sharp Shots

You can use a variety of clamp devices to secure your camera to all sorts of stable objects. A simple C-clamp that is equipped to thread into the tripod socket of your camera body is great for occasions when you are taking pictures from your vehicle. Install the clamp on a window and mount your camera. Raise or lower the window to change the height of your camera. You can tilt and pan this type of support for more versatility. It's amazing how much help such a simple and inexpensive item like this can be.

C-clamps can be attached to tree branches, railings, windows, and all sorts of other items. However, they are limited in their size, and this can be a problem. For example, you would not be able to get a C-clamp secured on the trunk of many trees. But never fear, tree clamps are available. These clamps circle a tree and provide a very sturdy support for your camera.

When you start to shop of photography accessories, you may be amazed at how many there are. If there is something that you want to do with your camera, you can feel pretty sure that someone is selling something that will allow you to do it.

Teeny-Weeny Tripods

Tiny tripods may not seem like much of a support system, but even they have their place in good photography. I have a little tripod that has retractable legs. The entire unit has a diameter similar to that of a D-cell flashlight battery. Total length is probably about six inches, when the legs are contained. This itsy bitsy tripod works well for table-top setups and low-to-the-ground shots, but it does require me to hold it. The tripod is not sturdy enough to support a camera and lens safely on its own.

I have found another very good use for my table-top tripod. It can be used as something of a chest-pod. By extending the legs and pressing them into my chest, the little tripod makes an excellent support. The ball-and-socket swivels to put my viewfinder at eye level while the tripod extends outward from my chest. This creates a surprisingly stable shooting platform.

Gun Grips

Gun-type grips are another support option for your camera. The device I'm referring to is similar in design to the stock of a rifle or shotgun. Your camera is mounted on the device and is fired by a shutter-release that is incorporated into the system. By pulling the shoulder stock in tight to your body and supporting the extended end with one hand, it's possible to get very steady shots.

If you get caught afield without a commercial camera support, you may have to improvise. Brace your camera or lens against the trunk of a tree to stabilize it. Settle your lens between the forks of a tree or tree branch to hold it still. Use a fence to support the base of your camera. Fences, rails and posts are frequent supports for zoo photographers. If you're doing your photography indoors, a door frame will work as a make-shift support. The back of a chair can be used to steady your lens. If you take the time to look around, you are almost certain to find something that will add some stability to your camera. The few moments spent looking for such a support can mean the difference between a great picture and a blurry one.

About the Author

R. Dodge Woodson is a full-time internationally-known, best-selling author and photographer. Dodge recently entered semi-retirement and created the World Photographers Organization (WPO). Photographers of all skill levels come to WPO to learn, to increase their sales, and to take advantage of the extensive resources offered to the general public and members. He also created an e-commerce site, www.ccionlinesales.com to showcase his brainchild. the Book Buster e-books. The site offers a full selection of Book Busters, e-books, used bound books, new bound books, stock photography, and much more. Having been a pro photographer for more than 30 years and a full-time writer for 17 years, Dodge now feels it is time to share his tricks of the trade with up-and-coming freelancers.

Tripod mount for Canon Rebel XT...?

Does this require any special kind of mount? I'm looking at buying a tripod for my camera off ebay but I noticed some tripods say "Works with MOST Digital Camera's"

It should. The Rebels I have owned all did.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

New White 6 Reflector Telescope with Tripod w Mount    US $229.99

New Black 6 Reflector Telescope with Tripod w Mount    US $229.99

New Silver 6 Reflector Telescope with Tripod w Mount    US $229.99

NEW BLACK TELESCOPE GIANT 6 MIRROR W TRIPOD WITH MOUNT    US $229.99

NEW WHITE 45 REFLECTOR TELESCOPE w EQ Mount Tripod    US $159.99

New Black 16 40 x 80mm Telescope with Tripod w Mount    US $99.99

New Blue 16 40 x 80mm Telescope with Tripod w Mount    US $99.99

New White 50mm Refractor Telescope with Tripod w Mount    US $15.50

New Black 50mm Refractor Telescope with Tripod w Mount    US $59.99

New Silver 6 Telescope with Advanced Tripod EQ Mount    US $229.99

New Pink 16 40 x 80mm Telescope with Tripod w Mount    US $99.99

New White 16 40 x 80mm Telescope with Tripod w Mount    US $99.99

New Pink 50mm Refractor Telescope with Tripod w Mount    US $59.99

New Silver 16 40 x 80mm Telescope with Tripod w Mount    US $99.99

New Blue 50mm Refractor Telescope with Tripod w Mount    US $59.99

Telescope 15X Erect Image 2X Barlow Tripod Cam Mount    US $49.99

New Black 90mm Refractor Telescope w Tripod and Mount    US $249.99

New Silver 90mm Refractor Telescope w Tripod EQ Mount    US $249.99

New Silver 90mm Refractor Telescope w Tripod and Mount    US $249.99

NEW BLUE 70mm REFRACTOR TELESCOPE w Tripod and Mount    US $149.99

NEW WHITE 70mm REFRACTOR TELESCOPE w Tripod and Mount    US $149.99

NEW SILVER 6 REFLECTOR TELESCOPE W TRIPOD WITH MOUNT    US $229.99

NEW WHITE TELESCOPE 6 REFLECTOR W TRIPOD AND MOUNT    US $229.99

Celestron CG4 Equatorial Telescope Mount Steel Tripod    US $239.99

New Silver 50mm Refractor Telescope with Tripod w Mount    US $59.99

Celestron Deluxe Equatorial Telescope Mount Tripod    US $99.99

Celestron Deluxe Telescope Tripod Mount Very Nice    US $89.99

Celestron Equatorial Mount Tripod for Telescope NEW    US $99.00

Celestron CG 3 Equatorial Mount Tripod for Telescope    US $159.99

	5 in Classic Nautical Sundial Compass in solid Brass List Price: $38.95 Sale Price: $32.58 Average Rating:
	This is a finely crafted, solid brass sundial and compass in one convenient unit. This unit allows an individual to tell the exact time by taking into account all local variables, a marker to account for the declination of the sun, a sundial, and a compass with a magnetic needle...

	Brass Pocket Compass with Cover and Antique Finish List Price: $9.95 Sale Price: $8.10
	This beautiful small brass pocket compass, with an antique finish, is approximately 1 3/4" in diameter and has a top loop so you can attach it to your key chain or backpack. The face of the compass is black to make it easy to read and it is protected by a sturdy brass hinged cover...

	1 3/4" Small (Brass Face) Brass Pocket Compass w/ Cover List Price: $9.95 Sale Price: $8.10 Average Rating:
	Compasses are a navigational instrument designed to align themselves with the Earth's magnetic field. They generally use a needle to indicate the direction of North, and prove to be invaluable when in the wilderness or out at sea...

	Lighthouse Isokinetic Tripod Mount Sample Probe 1.0 CFM Barbed Sale Price: $49.99
	For use in Ambient Air Sampling to provide Isokinetic air sample to sensor - different versions are available for higher flow rate particle counters. The product referenced on this detail page is sold be Each.

	Lighthouse Isokinetic Tripod Mount Sample Probe 1.0 CFM Barbed, Stainless Steel Sale Price: $95.00
	Isokinetic Tripod Mount Sample Probe For use in Ambient Air Sampling to provide Isokinetic air sample to sensor - different versions are available for higher flow rate particle counters. The product referenced on this detail page is sold be Each.

	Thought Out PED3-TriPhone Steel Tripod Mount Holder (iPhone 4, 3GS, 3G, Original) Sale Price: $27.99
	PED3-TriPhone is a metal rotating iPhone tripod mount and holder that makes great use of the video features as well as the still camera and the slew of other great applications. Mount your iPhone to your tripod for stable and clear videos and photos with continuous 360 degree rotation...

	THOUGHT OUT PED3-TriPhone-FORM Steel Tripod Mount Holder (iPhone 4, 3GS, 3G, Original) Sale Price: $31.99
	PED3-TriPhone-FORM is a metal rotating iPhone tripod mount and holder for a cased or skinned iPhone that makes great use of the video features as well as the still camera and the slew of other great applications...

	DURAGADGET Window / Windscreen / Windshield suction mount tripod mount holder for Sony DSC HX5V Sale Price: $9.99

	DURAGADGET Window / Windscreen / Windshield suction mount tripod mount holder for Canon Vixia HF S21 Sale Price: $9.99

	DURAGADGET Window / Windscreen / Windshield suction mount tripod mount holder for Casio Exilim ex z720 / z700 / ex-h10 / EX-Z2000 / EX-H15 / EZ-550 / EX-450 / EX-400 / EX-10HG Hybrid GPS / G / EX-G1 / EX-FC150, EX-FH100, Sale Price: $9.99

Mount Tripod

newtonian telescope

A Telescope Buying Guide for Beginners

Telescope is an exciting physics equipment. Buying a telescope is a daunting task for a newcomer. It all depends on your astronomy goals and careers. There is no perfect one which suits all observers in all conditions. You have to look for the features you want in your telescope and select the best one's according to your requirement.

Selecting the proper type

• The refractor type telescopes best suit for watching moon and major planets. Refractor telescopes are long & thin, and known for their sharp, detailed and contrasty images. They collect light through multi-element lenses. If you are just a starter then a small, quality achromatic refractor of 60 to 90 mm aperture would be a good one. The best thing about a refractor telescope is that they are inexpensive, portable and almost maintenance free. A refractor telescope is also useful when you will be mostly observing from city or the surrounding areas where the night skies are lightly polluted.
• Reflector telescopes are also known as Newtonian telescopes. They are good for planetary as well as deep-sky viewing. However Newtonian telescopes are more fragile and need more maintenance than others. These telescopes collect light with a curved, concave mirror and with the help of their large apertures, they show fine, highly-resolved images. The reflector scopes are not suitable for terrestrial viewing because they produce an upside-down image.
• Catadioptrics use both lenses and mirrors to collect and focus the incoming light. They are also called compound telescopes. Catadioptrics scopes are considered the most versatile telescopes and gives great all-around performance. They use a large aperture in very compact tubes. They show magnificent images of the moon, planets and faint deep-sky objects, when viewed in dark skies away from urban areas. These scopes are best suited for astrophotography. Compared to other two, these scopes have a wide range of accessories available. They can be entirely computer controlled.

Factors affecting the performance of a telescope

• • Aperture: Telescopes collect light from distant objects and focus it to produce images. The light collecting capacity of a telescope is the most important feature. It is the aperture of scope (diameter of mirror or lens) that is responsible for gathering light. Larger the aperture, the more light gathered, the more you'll see.
  • Telescope Mounts: There are three basic mounts for telescopes altazimuth, Dobsonian, or equatorial. Altazimuth is the simplest type of mount, providing up-down, left-right motions. It is mainly recommended for terrestrial viewing and casual stargazing. The Dobsonian mount was basically designed for easy maneuvering of large reflectors of more than six inches. It is a boxy altaz-type mount sitting close to the ground. Equatorial mounts are designed for the purpose of astronomical viewing. These mounts are more expensive and complicated than the altazimuth mounts. With the help of these type of mounts users can track or follow the motion of celestial objects through the sky with a single manual hand control.
  • Magnification: Magnification should never top the priority for buying a telescope. The quality if image degrades with magnification. Practically 300X is maximum magnification for good quality images. Telescope's magnification is also known as its power and it is adjusted by changing eyepieces. Ideally there should have been three eyepieces for the magnification of a scope: one low, one medium and one high. Lower powers of 30 - 50X are recommended for observing galaxies, star clusters and nebulae as they are spread over a wide area of sky. For observing the rings of Saturn, Jupiter, studying craters and valleys of the Moon's surface medium power of 80 - 100X are advised. Higher powers of 150 - 200X allow the astronomers to observe mountain peaks and fine lunar detail, the surface features of Mars.

I am a laboratory analyst by profession working in this industry from last 10 years. I have been running a site http://www.laboratoryequipmentworld.com on laboratory equipments. It includes the largest range of laboratory apparatus and other updated info on market, trade fairs, news, etc.

About the Author

I am a laboratory analyst by profession working in this industry from last 10 years.I have been running a site www.laboratoryequipmentworld.com on laboratory equipments. It includes the largest range of laboratory apparatus and other updated info on market, trade fairs, news, etc.

Could you help me with collimating my Newtownian telescope?

I have a Newtonian reflector telescope that I'm practically scared to use, partly because I can't find a good, "Collimation For Idiots," comprehendable website and partly because nobody I know knows what the heck I'm talking about. Any tips, tricks, or recommended websites out there?
EDIT: There's a tool?

There are many resources on the web about this - just search for "Newtonian collimation". They say basically the same thing, just different wording, so you may prefer one over the other. Since this depends on your style, I won't give any specific web resource; you may try this one: http://skytonight.com/howto/diy/3306876.html
You may join a telescope-related newsgroup; in the Resources section, you are likely to find one or more collimating-related file.

Collimating can be done in several ways:
1. Without tools (looking through the center of the focuser tube, eventually using a peephole, to help you get the tube cneter)
2. Using simple conventionsl tools, such as a Cheshire eyepiece)
3. Using a laser collimator, probably the most expensive tool (50 to 80 USD, range is approximate), and some say that it is the most precise. Laser collimators usually come with instructions.
4. A simpler method is the barlowed laser collimation (search for "barlowed laser"); for this, you can improvise the tool with a laser pointer, and instead of a barlow, use one of the diffraction patterns supplied with the pointer; unlike the laser collimator, it does not need to be precisely aligned, it only needs to start in the center of the focuser tube.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

Galileo 800mm 80mm Newtonian Reflector Telescope FS    US $129.94

CSTAR OPTICS 360 NEWTONIAN TELESCOPE GREAT DEAL    US $29.99

New White 6 Newtonian Reflector Telescope w Tripod    US $229.99

10 f 8 newtonian telescope RF Royce    US $800.00

NEW Celestron PowerSeeker 127 EQ Newtonian Telescope    US $149.95

MEADE SCHMIDT NEWTONIAN TELESCOPE OTA 152MM    US $80.00

Celestron LCM114 Computerized Newtonian Telescope NEW    US $299.00

Vixen R130Sf 130mm f 5 Newtonian Reflector Telescope    US $249.00

150 mm EQUATORIAL NEWTONIAN REFLECTOR TELESCOPE 2010    US $399.99

114 mm EQUATORIAL NEWTONIAN REFLECTOR TELESCOPE 2010    US $199.99

Celestron Telescope Newtonian 114mm 910mm focal length    US $129.99

Newtonian Reflecting telescope of Isaac Newton souvener    US $99.00

WHITE 6 NEWTONIAN REFLECTOR TELESCOPE TRIPOD NEW FREE    US $217.88

Edmund Scientific 6 Inch Newtonian Telescope    US $132.50

WHITE 6 NEWTONIAN REFLECTOR TELESCOPE TRIPOD NEW FREE    US $217.88

Tal 1 Russian made 43 Newtonian reflector telescope    US $639.59

SKY WATCHER GREATSTART 130N EQ2 NEWTONIAN REF TELESCOPE    US $118.89

	Orion SkyView Pro 8" EQ Reflector Telescope List Price: $649.95 Sale Price: $649.95 Average Rating:
	Prepare to be amazed with our SkyView Pro 8 EQ reflector. It's got a full 8" (203mm) parabolic primary mirror, which gathers 73% more light than a 6". Observe the Messier Catalog and a host of other deep-sky objects with the reach of this scope! And if you're into the Moon and planets, SkyView Pro 8's 1000mm focal length (f/5) gives you the appropriate image scale to resolve the finest detail...

	Swift 863R 4.5in. Newtonian Reflector Telescope Sale Price: $230.95
	The Swift 863R is a 114mm (4.5'') diameter, 900mm focal length Newtonian reflector telescope, with an equatorial mount, aluminum tripod, 5x20 finderscope, 6, 9 and 20mm Kellner 1.25'' eyepieces, for magnifications from 45-150x...

	Orion 203mm f/4.9 Reflector Telescope Tube Assembly with Crayford-Style Focuser List Price: $309.95 Sale Price: $309.95
	Responding to your requests, we are pleased to offer this reflector optical tube assembly (OTA) for folks who already have an equatorial mount. This optical tube assembly includes parabolic mirror optics, center marked for easy collimation...

	How to Make a Telescope ( Second English Edition) List Price: $24.95 Sale Price: $24.94 Average Rating:
	The first edition of this book was universally acclaimed as the best book ever written for making a Newtonian telescope. This 2nd Edition is almost three times larger and adds to the original text new chapters on making a Cassegrainian telescope, optical windows, and equatorial mounts...

	Geometric Optics: Theory and Design of Astronomical Optical Systems Using Mathematica® (Modeling and Simulation in Science, Engineering and Technology) List Price: $99.00 Sale Price: $66.67
	This book—unique in the literature—provides readers with the mathematical background needed to design many of the optical combinations that are used in astronomical telescopes and cameras. The results presented in the work were obtained by using a different approach to third-order aberration theory as well as the extensive use of the software package Mathematica®...

newtonian telescope

Dobsonian Telescope

	Orion SkyQuest XT8 Classic Dobsonian Telescope List Price: $329.95 Sale Price: $329.95 Average Rating:
	Orion SkyQuest XT8 Classic Dobsonian Telescope

Choose a Good Beginners Telescope - Cut Through the Information Overload

So you've been bitten by the astronomy bug and want to get started with your very own telescope, but you're confused by the vast number of possible purchases? You are not alone, astronomy stores are accustomed to dealing with the confused beginner though of course not everybody has the opportunity to visit a specialist store. This article is intended to help cut through some of the confusion.

It's important to choose a telescope that is right for you, for example there is no point having a great big Dobsonian if you rarely get the chance to assemble it in a good dark sky location.

There are several factors to be considered from practical considerations like size, weight and portability to the price you can afford and indeed where you'll be doing the majority of your observing. Ignoring more advanced uses like astrophotography we might think along the following lines.

As a general rule, the larger the aperture the more you can expect out of your telescope. Refractors will generally outperform similar size reflectors. Refractors however are more expensive than reflectors, due to the extra high quality glass involved. They can also be impractical to handle at larger apertures where they can also reach very long tube lengths.

Large aperture reflectors can have comparatively short tubes and be very easy to handle as well as inexpensive. There is a little extra maintenance involved as you may need to clean and align the mirror from time to time, this procedure is known as collimation.

Catadioptric telescopes are a combination of refractor and reflector and are quite portable even at large apertures. A great many amateur astronomers who have access to good dark sky sites, ultimately end up with catadioptric telescopes because the offer a range of possibilities including astrophotography. The large ones, like most large aperture scopes, are not ideal in light polluted areas like the city and suburbs.

Those big Dobsonian telescopes are really just big reflectors mounted on simple turntables and their attraction is their huge light capture and simplicity of use, making them ideal for visual astronomy in a good location (again they are not so good in light polluted areas).

If you do not relish the thought of learning to find your way around the skies you could consider purchasing one of the models that come with a computerized mount. These 'Go-To' telescopes have made finding targets a breeze.

With those facts in mind you can now think about where you are going to do the most observing and choose a suitable beginners telescope. If you live in the city and are unlikely to get to a rural location for observing then perhaps stick with the small to medium size refractors, reflectors or catadioptrics, with or without the go-to function, your budget will probably start to dictate the choices here! If on the other hand you live in a dark sky area then my recommendation is to buy a great big Dobsonian. These offer so much viewing pleasure and are so simple to use it is difficult to fault them.

About the Author

See my Squidoo page for more on how to choose a good beginners telescope and some specific recommendations and absolute bargains!
Telescopes for Beginners
, a site helping others get a start in astronomy.
Telescopes for Beginners

i have an 8 inch dobsonian telescope, whats the best magnification i can get?

all i ver get is the outlines of the planets, and it shows up fairly small, what can i do to get really high magnification, what type of eyepieces do i neeed?

The planets *are* small dots in amateur telescopes.

With experience, you will learn to see the detail in those small dots.

The usual rule of thumb (2x per millimeter of aperture) says that the maximum magnification you would want to use on your telescope is 400x. This assumes perfect seeing, which rarely happens. Your views are usually limited by the atmosphere.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

NEW MEADE 10 LightBridge TrussTube Dobsonian Telescope    US $639.00

10 f 56 Dobsonian Telescope with Koenig Eyepiece    US $62.27

FoldScope Twelve Inch Dobsonian Astronomical Telescope    US $3,300.00

Celestron FirstScope 76mm Dobsonian Telescope    US $44.95

Galileo DB 160 1300mm x 160mm Dobsonian Telescope    US $234.99

Rokinon Dobsonian Table top Telescope 300 x 76mm    US $59.99

Meade LightBridge Deluxe 16 Truss Dobsonian Telescope    US $1,849.00

14 DobSTUFF Dobsonian Telescope w many many extras    US $2,500.00

Galileo 500mm 80mm Dobsonian Reflector Telescope NEW    US $74.99

ORION SKYQUEST XT12 CLASSIC 12 DOBSONIAN TELESCOPE    US $449.99

Celestron FirstScope Dobsonian Reflector Telescope NEW    US $49.99

GALILEO DB 135 DOBSONIAN REFLECTOR TELESCOPE STAND    US $199.99

New 76mm Dobsonian Table top Telescope    US $59.99

Rokinon DB76 ViewStar Dobsonian Telescope NEW    US $99.95

20 inch Parabolic Dobsonian Telescope Primary Mirror    US $2,499.00

Bushnell DOB 6 Dobsonian Telescope OpticsPlanet    US $349.99

Celestron Dobsonian Reflector Telescope FREE STUFF    US $44.99

Meade 8 inch Truss Tube Dobsonian Telescope FREE SHIP    US $460.00

	Orion SkyQuest XT8 Classic Dobsonian Telescope List Price: $329.95 Sale Price: $329.95 Average Rating:
	Orion SkyQuest XT8 Classic Dobsonian Telescope

	The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes List Price: $29.95 Sale Price: $29.95 Average Rating:
	This book tells how you can build a state-of-the-art Dobsonian telescope using readily available materials and supplies. Every step of construction is detailedin photographs and diagrams, and the underlying ideas are carefully explained...

	Orion SkyQuest XT4.5 Classic Dobsonian Telescope List Price: $229.95 Sale Price: $229.95 Average Rating:
	Without spending a fortune you can get a telescope that will not only satisfy the kids, but the kid in you! Our SkyQuest XT4.5 is a quality telescope, with point-and-view simplicity that makes it easy to use and makes stargazing fun! The optical performance is far and away better than flimsy department store models...

	Orion SkyQuest XT8i IntelliScope Dobsonian Telescope with Object Locator List Price: $529.95 Average Rating:
	Orion's SkyQuest XT8i Intelliscope Dobsonian Computerized Telescope combines powerful 203mm-diameter reflector optics with point-and-view simplicity in a nicely portable package. With the included IntelliScope Computerized Object Locator, the amateur stargazer can pinpoint the location of 14,000+ celestial wonders stored in the IntelliScope's databank...

	Orion SkyQuest XT6i Computerized IntelliScope List Price: $399.95 Sale Price: $399.95 Average Rating:
	This remarkable scope combines powerful 150mm-diameter reflector optics with point-and-view simplicity in one nicely portable package. And with the included IntelliScope Computerized Object Locator, even the novice stargazer can pinpoint the location of 14,000+ celestial wonders stored in the IntelliScope's databank...

	Fun with telescopes List Price: $2.99
	Has The Night Sky Always Fascinated You Since You Were A Child? Do You Often Wonder What Lies Beyond The Dark Expanse Above? Do You Want To Fathom The Mysteries Of The Infinite Universe?At Last! A Guide That Explains Astronomy And Telescopes In Layman's Language, Leaving All The Technical Jargon Out! Understand The Basics Of Astronomy And Telescopes...

	Tom Swift and His Giant Telescope List Price: $3.55
	Tom Swift appeared to be calm, although in reality he was about as excited over his latest invention as he ever had been about anything in his life.

	Orion SkyQuest XT10 10" Classic Dobsonian List Price: $499.95 Sale Price: $499.95 Average Rating:
	Orion(r) SkyQuest(TM) XT Classic Dobsonians It's no wonder customers heap 5-star ratings on these "gentle giants." For not only do their jumbo-sized optics and uncomplicated design bring a "new level of joy to simple observing," raved Astronomy magazine, but they're also the most affordable quality Dobs on the market...

Dobsonian Telescope

dobsonian telescope 16

	Meade 16-Inch LightBridge (f/4.5) Truss-Tube Dobsonian List Price: $1,849.00 Sale Price: $1,849.00 Average Rating:
	Includes Meade 16 Inch Lightbridge F/4.5 Truss-tube Dobsonian Deluxe.

eyepiece collection?

please rate my eyepiece collection:

Eyepiece preference is a personal thing, so you'll have to decide which ones are keepers. I think six eyepieces plus a barlow constitute an adequate collection - something like 6, 9, 12, 16, 25, 30. The 40 mm Plossl (assuming it's a 1.25") has a narrow apparent field and shows about as much sky as the 30 mm, so it can probably go. If you haven't already formed an opinion, compare the performance of your 25-26 mm Plossls and keep the best one. Consider whether you need both 20 and 25 mm focal lengths; you may find you have three superfluous eyepieces. Choose one from the 9.7-10 mm, too. Depending on how good the Plossls are, you might want to get rid of the 6.5, 9.7, 10, and 15 and use the Expanse eyepieces exclusively.

Huygens for solar viewing? Are you doing solar projection? Not a good idea with a reflector, as it can focus the sunlight on the inside of the tube and burn it. And if your secondary is glued on, the heat can weaken the bond and make it fall on your primary. Better to get some Astro-Solar film and make a solar filter.

As I see it, you could sell maybe eight of your Plossls. Decide which focal length you get the most use out of, and put the money towards a premium eyepiece in that focal length. Buy used on Astromart ( http://www.astromart.com/ )for the best deals.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

Meade LightBridge Deluxe 16 Truss Dobsonian Telescope    US $1,849.00

	Meade 16-Inch LightBridge (f/4.5) Truss-Tube Dobsonian List Price: $1,849.00 Sale Price: $1,849.00 Average Rating:
	Includes Meade 16 Inch Lightbridge F/4.5 Truss-tube Dobsonian Deluxe.

dobsonian telescope 16

dobsonian telescope

	Orion SkyQuest XT8 Classic Dobsonian Telescope List Price: $329.95 Sale Price: $329.95 Average Rating:
	Orion SkyQuest XT8 Classic Dobsonian Telescope

How to Use a Telescope - Comprehensive Telescope Kits

For the budding stargazer, the most important instrument in his inventory should be a telescope. Once this debate is resolved, the next question is where to source this all important instrument from. You can work from scratch, buy all the raw material required, and build your own telescope, or you can take the easier and more practical way out and buy yourself a telescope kit which contains every last thing you will need to make you telescope and then just assemble the supplies together. It is the telescope kit that is the recommended option for a beginner. Ideally, only professional should attempt to build a telescope out of practically nothing. Telescope kits not only come with everything you need to build a good telescope, they also contain a descriptive instruction manual that will lead you through each step of the telescope construction process.

The commonly available kits have the elements and the guides for making a Dobsonian telescope. This telescope uses a secondary mirror in addition to a primary mirror. The other optical constituents of this telescope are a finder scope, an eye piece, a focuser, and the mirror support system. The housing compartment for all these elements is not included as part of the kit.

Using such kits to construct your own telescope is graced with numerous advantages. Most of these advantageous highlights are meant for beginners, who can save both time and money with this option. A complete kit allows the builder to save the time that would otherwise be spent searching high and low for the correct components. The average price of a telescope kit is $200 to $300. They can be purchased at hobby centers everywhere, and if you find a discount, the better bargains you will get.

For teachers who need a demonstration to incite the interest of youngsters and get them hooked onto an interesting hobby such as this, telescope kits are a good teaching aid. It is possible to use such a kit for classes in school and demonstrate the whole process to the students. There is no age restriction for this ho9bby, making it a good hobby for anyone interested in it.

Telescope kits generally are aimed at beginners, amateurs just starting out on their telescope love affair, or at students of the astronomy who intend to pursue a profession in the field someday. To build a telescope using such a kit, you do not need a degree in astronomy or even the experience of an expert. Absolutely any novice is capable of constructing a decent instrument with the instructions given. Manuals that come with the kits, are step-by-step guides, and even have diagrams that explain the methods detailed. Affordably price, and attractively marketed, these kits can pack a pretty powerful telescope and are a lure for any beginner.

It takes only 2-3 days to have an operational, fully functional telescope in your hands after you get your kit. The total work-hours required for it are hardly 15 or 20 from your time. You can work for an hour a day or work a marathon stretch over two days to complete your project. A lazy weekend is the best time to get started. There is never the complication that arises from missing a crucial element during purchase, because these kits always have everything. If you find something damaged, you can have it replaced at the store you bought the kit from. However, it is best to run through the content of the kit and check for quality at the time you make the purchase.

If you are a beginner, do not think too much about basic construction from sourced raw material. If you are a professional, however, you have the options open to you.

About the Author

Uncover more interesting facts about telescopes as well as getting free hubble space telescope pictures when you visit http://www.howdotelescopeswork.com, the free portal dedicated to telescope making and usage.

I am considering making my own 6 or 8 inch dobsonian telescope. What's a good focal ratio for general views

Use whatever you can get: it doesn't make *that* much of a difference. 6 inch f/8 and 8 inch f/6 are stock items, and result in a reasonable tube length.

If you are planning to grind your own mirror, you should not have to ask here.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

NEW MEADE 10 LightBridge TrussTube Dobsonian Telescope    US $639.00

10 f 56 Dobsonian Telescope with Koenig Eyepiece    US $62.27

FoldScope Twelve Inch Dobsonian Astronomical Telescope    US $3,300.00

Celestron FirstScope 76mm Dobsonian Telescope    US $44.95

Galileo DB 160 1300mm x 160mm Dobsonian Telescope    US $234.99

Rokinon Dobsonian Table top Telescope 300 x 76mm    US $59.99

Meade LightBridge Deluxe 16 Truss Dobsonian Telescope    US $1,849.00

14 DobSTUFF Dobsonian Telescope w many many extras    US $2,500.00

Galileo 500mm 80mm Dobsonian Reflector Telescope NEW    US $74.99

ORION SKYQUEST XT12 CLASSIC 12 DOBSONIAN TELESCOPE    US $449.99

Celestron FirstScope Dobsonian Reflector Telescope NEW    US $49.99

GALILEO DB 135 DOBSONIAN REFLECTOR TELESCOPE STAND    US $199.99

New 76mm Dobsonian Table top Telescope    US $59.99

Rokinon DB76 ViewStar Dobsonian Telescope NEW    US $99.95

20 inch Parabolic Dobsonian Telescope Primary Mirror    US $2,499.00

Bushnell DOB 6 Dobsonian Telescope OpticsPlanet    US $349.99

Celestron Dobsonian Reflector Telescope FREE STUFF    US $44.99

Meade 8 inch Truss Tube Dobsonian Telescope FREE SHIP    US $460.00

	Orion SkyQuest XT8i IntelliScope Dobsonian Telescope with Object Locator List Price: $529.95 Average Rating:
	Orion's SkyQuest XT8i Intelliscope Dobsonian Computerized Telescope combines powerful 203mm-diameter reflector optics with point-and-view simplicity in a nicely portable package. With the included IntelliScope Computerized Object Locator, the amateur stargazer can pinpoint the location of 14,000+ celestial wonders stored in the IntelliScope's databank...

	Orion SkyQuest XT6i Computerized IntelliScope List Price: $399.95 Sale Price: $399.95 Average Rating:
	This remarkable scope combines powerful 150mm-diameter reflector optics with point-and-view simplicity in one nicely portable package. And with the included IntelliScope Computerized Object Locator, even the novice stargazer can pinpoint the location of 14,000+ celestial wonders stored in the IntelliScope's databank...

	The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes List Price: $29.95 Sale Price: $29.95 Average Rating:
	This book tells how you can build a state-of-the-art Dobsonian telescope using readily available materials and supplies. Every step of construction is detailedin photographs and diagrams, and the underlying ideas are carefully explained...

	Fun with telescopes List Price: $2.99
	Has The Night Sky Always Fascinated You Since You Were A Child? Do You Often Wonder What Lies Beyond The Dark Expanse Above? Do You Want To Fathom The Mysteries Of The Infinite Universe?At Last! A Guide That Explains Astronomy And Telescopes In Layman's Language, Leaving All The Technical Jargon Out! Understand The Basics Of Astronomy And Telescopes...

	Tom Swift and His Giant Telescope List Price: $3.55
	Tom Swift appeared to be calm, although in reality he was about as excited over his latest invention as he ever had been about anything in his life.

	Orion SkyQuest XT8 Classic Dobsonian Telescope List Price: $329.95 Sale Price: $329.95 Average Rating:
	Orion SkyQuest XT8 Classic Dobsonian Telescope

	Orion SkyQuest XT4.5 Classic Dobsonian Telescope List Price: $229.95 Sale Price: $229.95 Average Rating:
	Amazon.com Review Orion’s Skyquest XT4.5 is the smallest in their Dobsonian line of telescopes that includes the B00020WZB0 XT6 , XT8 , and XT10. Newcomers to the hobby are always surprised at how large amateur telescopes are, but to experienced observers, this XT4...

	Orion SkyQuest XT10 10" Classic Dobsonian List Price: $499.95 Sale Price: $499.95 Average Rating:
	Orion(r) SkyQuest(TM) XT Classic Dobsonians It's no wonder customers heap 5-star ratings on these "gentle giants." For not only do their jumbo-sized optics and uncomplicated design bring a "new level of joy to simple observing," raved Astronomy magazine, but they're also the most affordable quality Dobs on the market...

dobsonian telescope