Telescope Eye Piece
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Wallmonkeys Peel and Stick Wall Decals - Coin Operated Binoculars - Removable Graphic
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DescriptionWallMonkeys wall graphics are printed on the highest quality re-positionable, self-adhesive fabric paper. Each order is printed in-house and on-demand. WallMonkeys uses premium materials & state-of-the-art production technologies. Our white fabric material is superior to vinyl decals. You can literally see and feel the difference. Our wall graphics apply in minutes and won't damage your paint or leave any mess. PLEASE double check the size of the image you are ordering prior to clicking the 'ADD TO CART' button. Our graphics are offered in a variety of sizes and prices. WallMonkeys are intended for indoor use only. Printed on-demand in the United States Your order will ship within 3 business days, often sooner. Some orders require the full 3 days to allow dark colors and inks to fully dry prior to shipping. Quality is worth waiting an extra day for! Removable and will not leave a mark on your walls. 'Fotolia' trademark will be removed when printed. Our catalog of over 10 million images is perfect for virtually any use: school projects, trade shows, teachers classrooms, colleges, nurseries, college dorms, event planners, and corporations of all size. Features
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How To Pick A Good Pair Of Binoculars
Binoculars aka field glasses are like two telescopes pointed at the same area. It is easy to perceive depth because it has two lenses and not just one, like a monocular.
The binoculars have been around since about the 17th century after telescopes have been invented. People use to mount two telescopes side by side and looked through them with both eyes.
Between the 1850-1890s, a prism type of binocular was invented that allowed greater depth perception by allowing the eye pieces to be spaced wider apart. These binoculars allow greater magnification.
The most affordable binoculars are porro prisms that allow for brighter images and are precise instruments. These binoculars are wider and sometimes need to be re-aligned.
An expensive kind of prism binocular is the roof prism binocular. This binocular is smaller and narrower but loses some brightness. The good think about them is that they usually never have to be re-alligned. They are also much lighter. Optical coating fixes this problem. That is why many roof prism binoculars are coated.
Optical Coating is a great feature that helps make a brighter image by reducing the amount of light that is reflected. Reflected light inside the binoculars makes the image hazy.
General Binoculars are focused by moving a round wheel that focuses both telescopes at once. More sophisticated binoculars use independent focus which means that each side of the binocular needs to be adjusted individually.
Some binoculars have image stabilization technology which dampen sudden movement. It can usually be turned on or off by the user. This means that very high powered binoculars can be hand held when normally they couldn't. The image quality is not always as good for stabilized binoculars, and they are usually more expensive.
Coin-operated binoculars are very popular in many tourist attractions. They allow a more detailed view. These are always mounted on a pedestal and are usually high powered.
Military Binoculars are usually hand held and at a magnification of 5x or 7x. Military binoculars are more rugged and sturdy than regular binoculars and they also use independent focusing because it is more sturdy than central focusing. Most military binoculars also have special features that help it work when wet or to block out laser beams. Sea binoculars are meant to be easier on the eyes because of the sea rocking back and forth.
Astronomical Binoculars allow people to view certain elements of the sky from far away. There are many moons and planets that can be viewed with binoculars. Pluto, Eris and Uranus can all be seen easier with the use of binoculars. Some users use lower magnification binoculars so they can have a larger field of view than if they used a higher magnification.
About the Author
Matt is a Binocular fanatic that has many binoculars available for sale at auction prices at his website Compact Binoculars.
how see sky first time by telescope?
i am biggner to look at sky. I just purchased telescope of 1000 focal length with 130 diameter.
how i see all planets with this telescope. eye pieces of 9 and 17 mm
Align the finder during the daytime. First, pick out a distant, non-moving object and get the big telescope centered on that object. Now, adjust the finder scope on that same object. Is it a red dot finder? Or is it a cross-hair little telescope? Either way, be sure the two are aligned before night. It is frustrating not to be able to find objects. If you have a red-dot finder, buy a spare battery now. I promise it will come in handy when the original battery wears out.
Planets are small and bright. Start with low power (17mm) and center the planet carefully before switching to 9mm. In eyepieces, the smaller the focal length, the higher is the magnification.
Most objects in the sky are large and dim. Andromeda galaxy is 6 full moons across. For dim objects, use lowest power. As magnification goes up, brightness of whole field goes down. Same light in telescope spread out over bigger picture makes a dimmer view.
Your telescope is equatorial type mount. Set polar axis to latitude of your city or town where you will observe. Polar axis points toward the north star (Polaris). This makes it so clock drive can follow planets or stars. If your telescope does not have a clock drive yet, a single handle turn will follow the planets or stars.
Hope this helps. 130 mm is good size telescope to begin with.
US $99.99
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Wallmonkeys Peel and Stick Wall Decals - Coin Operated Binoculars - Removable Graphic
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DescriptionWallMonkeys wall graphics are printed on the highest quality re-positionable, self-adhesive fabric paper. Each order is printed in-house and on-demand. WallMonkeys uses premium materials & state-of-the-art production technologies. Our white fabric material is superior to vinyl decals. You can literally see and feel the difference. Our wall graphics apply in minutes and won't damage your paint or leave any mess. PLEASE double check the size of the image you are ordering prior to clicking the 'ADD TO CART' button. Our graphics are offered in a variety of sizes and prices. WallMonkeys are intended for indoor use only. Printed on-demand in the United States Your order will ship within 3 business days, often sooner. Some orders require the full 3 days to allow dark colors and inks to fully dry prior to shipping. Quality is worth waiting an extra day for! Removable and will not leave a mark on your walls. 'Fotolia' trademark will be removed when printed. Our catalog of over 10 million images is perfect for virtually any use: school projects, trade shows, teachers classrooms, colleges, nurseries, college dorms, event planners, and corporations of all size. Features
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Wallmonkeys Peel and Stick Wall Decals - Coin Operated Binoculars - Removable Graphic
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DescriptionWallMonkeys wall graphics are printed on the highest quality re-positionable, self-adhesive fabric paper. Each order is printed in-house and on-demand. WallMonkeys uses premium materials & state-of-the-art production technologies. Our white fabric material is superior to vinyl decals. You can literally see and feel the difference. Our wall graphics apply in minutes and won't damage your paint or leave any mess. PLEASE double check the size of the image you are ordering prior to clicking the 'ADD TO CART' button. Our graphics are offered in a variety of sizes and prices. WallMonkeys are intended for indoor use only. Printed on-demand in the United States Your order will ship within 3 business days, often sooner. Some orders require the full 3 days to allow dark colors and inks to fully dry prior to shipping. Quality is worth waiting an extra day for! Removable and will not leave a mark on your walls. 'Fotolia' trademark will be removed when printed. Our catalog of over 10 million images is perfect for virtually any use: school projects, trade shows, teachers classrooms, colleges, nurseries, college dorms, event planners, and corporations of all size. Features
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Wallmonkeys Peel and Stick Wall Decals - Coin Operated Binoculars - Removable Graphic
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DescriptionWallMonkeys wall graphics are printed on the highest quality re-positionable, self-adhesive fabric paper. Each order is printed in-house and on-demand. WallMonkeys uses premium materials & state-of-the-art production technologies. Our white fabric material is superior to vinyl decals. You can literally see and feel the difference. Our wall graphics apply in minutes and won't damage your paint or leave any mess. PLEASE double check the size of the image you are ordering prior to clicking the 'ADD TO CART' button. Our graphics are offered in a variety of sizes and prices. WallMonkeys are intended for indoor use only. Printed on-demand in the United States Your order will ship within 3 business days, often sooner. Some orders require the full 3 days to allow dark colors and inks to fully dry prior to shipping. Quality is worth waiting an extra day for! Removable and will not leave a mark on your walls. 'Fotolia' trademark will be removed when printed. Our catalog of over 10 million images is perfect for virtually any use: school projects, trade shows, teachers classrooms, colleges, nurseries, college dorms, event planners, and corporations of all size. Features
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Celestron Accessory Kit
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DescriptionCelestron Accessory Kit Features
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Meade 20218 NG-70SM 70mm Altazimuth Refractor Telescope
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DescriptionMeade 20218 NG-70SM 70mm Altazimuth Refractor Telescope Meade's value priced NG-70SM Altazimuth Refractor is an affordable entry level telescope that features an easy to use Altazimuth mount with slow motion controls for precise tracking. The complete package includes a sturdy metal tripod, a red dot viewfinder, two 1.25 inch eyepieces and a star diagonal, and a software DVD with instructional video. The NG-70SM Refractor Telescope comes disassembled in a compact box, but the instructional DVD video guides you through all the steps required for assembly. Go ahead and try it out in the daytime, that's the best time to align the red-dot finder scope while looking at a distant tree or telephone pole. The optics of Meade's NG-70SM produce an image that is right side up but the diagonal mirror reverses the image left-to-right. That's no problem most of the time, but an optional correct image diagonal is available. The low power 25mm eyepiece produces a magnification 28X which is just right for spotting the Moon or the planets, while the 9mm eyepiece (78X magnification) can be used to zoom in for more detail. The MH25 eyepiece at 28X shows a lovely view of the Lunar disk in a dark sky, while the MH9 eyepiece at 78X shows literally hundreds of craters on the Moon and begins to show the rings of Saturn and the cloud bands of Jupiter. For even better views it's easy to add better eyepieces. My best view of Saturn, for example, came with an optional 6.4mm Super Plossl eyepiece, about 110X magnification. The Altazimuth mount included with Meade's NG-70SM is lighter and easier to use than an Equatorial mount, yet the slow motion knobs make it easy to keep objects in view. The rotation of the Earth causes the Moon or planets to appear to drift out of the eyepiece, but the slow motion knobs make it easy to keep the telescope on target, even with a high power eyepiece. The telescope is sensitive to vibration, however, so a high power eyepiece can be difficult to focus. Meade's NG-70SM is a good entry level telescope at a very good price. The optics are good, the Altazimuth mount is easy to assemble and easy to use, the instructional DVD includes a nice Lunar Atlas as well as planetarium software, and it's easy to add better eyepieces to improve your view of the planets. –Jeff Phillips Pros: Light and easy to use Altazimuth mount includes slow motion knobs Easy to add better eyepieces Instructional DVD included; Cons: MH eyepieces have narrow field of view Vibrates while focusing at high power MEADE 20218 NG-70SM 70mm Altazimuth Refractor Telescope Features
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Celestron 93230 8 to 24mm 1.25 Zoom Eyepiece
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DescriptionSuper-premium fully multi-coated 1.25" zoom eyepiece has a focal length of 8-24mm. Allows for expanded magnification options. Specifications: The Celestron 93230 8 to 24 millimeters 1.25 inch zoom eyepiece allows you to zoom instantly with your scope from 8x magnification to 24x magnification. Features
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Fisher-Price Kid-Tough Binoculars
Sale Price: $47.99 |
DescriptionTough enough for little explorers, with 2.4x magnification and rubberized lens guard bumpers. Soft eye-pieces, adjustable eye-piece spacing, breakaway neck strap and textured hand grips and focus knob make these binoculars safe, easy and fun for kids to use. Explore the world with your very own set of kid tough binocularsManual interocular adjusting makes it easier for kids to seeRubberized eye pieces and lens covers are comfortable and convenientSee far distances with a built-in manual focusNeck strap allows kids to take their favorite binoculars wherever they goProduct Measures: 7.5 x 5.12 x 4.62Recommended Ages: 36 - 96 months Features
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Orion Binocular Viewer for Telescopes with Sirius Eyepieces
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DescriptionYou were born with two eyes, so why not use both of 'em when stargazing with a telescope? Now you can, and you will be pleasantly surprised at what a difference it makes. The effect is most pronounced on the planets and Moon, but even deep-sky objects seem to have more clarity and depth. And now this popular accessory comes with a thread-on 2x barlow lens, so you can choose two levels of magnification. The hinged aluminum housing contains fully multi-coated BAK-4 prisms that provide high light transmission. Individual helical focusing collars ensure a sharp focus for each eye. The viewer's 1.25" nosepiece is threaded to accept filters. This complete package includes two high-quality 1.25" 20mm Sirius Plossl eyepieces, thread-on 2x barlow lens and case. Features
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Orion SkyQuest XT8 Classic Dobsonian Reflector Telescope
Sale Price: $489.00 |
DescriptionThe Orion XT series (available in 4.5", 6", 8", and 10") includes some of my favorite entry-level telescopes, and I recommend this one, the 8", most of all. It's well-made, has very good optics, is relatively cheap, isn't too big or too small, and has a nice look. It features an 8" mirror that gathers enough light to do serious work. The mount is a simple alt-az ("altitude-azimuth," a fancy term that simply means "up-down-left-right") design. There is no automated tracking mechanism. When the object in your field of view starts to go out of sight, you simply push to scope along to re-center it. This may sound inconvenient, but the axes are very smooth and responsive to the touch. To maintain tension, the altitude axis ("up-down") uses an innovative spring system. The springs also allow one hardy and ambitious individual to pick up and move it with one hand (the scope weighs 42 lbs.) A 6X30 finder scope is included to help you get oriented, as well as two eyepieces: a 25 mm Plossl (49X) and a 10 mm Plossl (121X). While these eyepieces are of decent quality, the dedicated observer will eventually want to upgrade to better eyepieces like one of Orion's own Ultrascopics. Regardless of eyepiece though, this scope will let you easily see Saturn's rings (this is something you do not want to miss, trust me), Jupiter and its four moons, dozens of named craters on the moon, and hundreds of star clusters, galaxies (wait until you see the Andromeda Galaxy) and nebulae. It'll keep you busy for years. Yes, you could go to the mall and get one of those cheap little computer-controlled gizmo telescopes. The problem is, those cute little scopes won't do any one thing well, and they don't gather enough light (the XT8's 8" mirror gathers eight to ten times as much light as those little 2"-3" scopes). If you've got a new-found interest in astronomy and want an entry-level telescope, you need look no further--although I should also point out that Orion has an excellent upgraded version of the scope called the "Intelliscope" which features the ability to locate thousands of objects by hand using a separately sold paddle-style controller. And if you can't swing the price of the XT8 Intelliscope, I recommend the slightly smaller XT6, which is also a great deal for the price. --Ed Ting Pros Great scope for the price At 8", the mirror is big enough to do serious work Includes two perfectly serviceable eyepieces Easy re-centering of objects Enough viewing power to keep you occupied for years Cons No automated tracking mechanism The serious sky watcher may need to eventually upgrade to a better eyepiece A not very portable 42 pounds Our classic XT8 isn't just great bang for the buck, it's a veritable explosion of telescope value. It combines powerful parabolic optics with the ultimate in mechanical stability. The SkyQuest XT8 features an 8" parabolic primary mirror that will tease out detail in nebulas, resolve stars in globular clusters, and reveal subtle structure in galaxies. The enameled steel optical tube sports a 2" aluminum rack-and-pinion focuser that accepts both 2" and 1.25" eyepieces. The tube moves effortlessly on Teflon/UHMW bearings for point-and-view simplicity. Comes complete with navigation knob, 6x30 finder scope, two 1.25" Sirius Plossl eyepieces, eyepiece rack, collimation cap, and hard dust cap. Features
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An essay on the genuine construction of a standard microscope and telescope: with the application of a prismatic or catadioptric eye-piece to refracting and reflecting telescopes, ... By B. Martin.
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DescriptionThe 18th century was a wealth of knowledge, exploration and rapidly growing technology and expanding record-keeping made possible by advances in the printing press. In its determination to preserve the century of revolution, Gale initiated a revolution of its own: digitization of epic proportions to preserve these invaluable works in the largest archive of its kind. Now for the first time these high-quality digital copies of original 18th century manuscripts are available in print, making them highly accessible to libraries, undergraduate students, and independent scholars.Medical theory and practice of the 1700s developed rapidly, as is evidenced by the extensive collection, which includes descriptions of diseases, their conditions, and treatments. Books on science and technology, agriculture, military technology, natural philosophy, even cookbooks, are all contained here.++++The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to insure edition identification:++++Library of CongressN065671London : printed for, and sold by the author, 1776. [2],14p. ; 4° |
