Apo Refractor
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Tele Vue NEW Up-Dated NP127is Imaging System 5" f/5.2, 4-Element APO Refractor Telescope Optical Tube Assembly, Ivory, New 10:1 focuser pinion assembly made for Tele Vue by Starlight Instruments. New lens prescription delivers smaller spots sizes over a broader wavelenght range.
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DescriptionConcept: CCD cameras have challenged telescope optics beyond anything ever placed at the focal plane. Tele Vue knew it's APO objectives were up to the challenge, & with the proper tweaks would be extraordinary tools for the imager. With Tele Vue Imaging System (is) telescopes, they have refined their instruments & optional equipment beyond anything a CCD chip has seen.For 25 years, Tele Vue has pushed the boundaries of APO refractors, & eyepieces, to the recognized pinnacle of performance. They were gratified but not surprised that Backyard Astronomer's Guide said of the NP101: "optics don't get any better than this." No wonder "Sky and Telescope" rated the NP101 tops & selected it as the test instrument for its landmark review of the SBIG STL-11000 CCD camera. The "is" versions of the Tele Vue- 60, 102i, NP101 & NP127 retain the exemplary wide field & planetary visual capability while adding new features to make imaging easier & more flexible.Tele Vue-NP101is Tele Vue-NP127is:Tele Vue was determined to make the NP series optically, mechanically, & functionally as perfect as possible for imaging up to 50mm diagonal chips with o ut penalty to its near ideal visual operation.How? By applying the developments created for the Tele Vue-60is to the new NP101is and NP127is & then going beyond. The NP101 (540mm, f/5.4, 4") & NP127 (660mm, f/5.2, 5") maintain their optical specifications yet with redesig Features
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if you already owned a 3 inch apo would you also get a 4 inch apo?
I have a 3 inch apo refractor and I am interested in also owning something with more aperture to complement the little scope. Is there a big enough difference in the 4 inch apo compared to the ed80, to justify the purchase? Or, should I save a few bucks and complement the ed80 with a ten inch dob? What would you do with a limited budget. Note: both apos are of the same brand and quality.
A 100mm Apo would be perfect for wide field Astrophotography, but so would an 80mm, which also has a wide field of view (depending on the focal length-usually f5-f6 or thereabouts).. They are both high quality, but you would be far better off buying a 10" Dob, it will be cheaper than a 100mm Apo and will give jaw dropping views of the planets, galaxies and many deep sky objects which need a high magnification. It will be difficult to take images through a Dob though without a special tracking mount for it.
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 William Optics FLT110 Apo Refractor Telescope with DDG  US $2,550.00
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 Sky Watcher S11100 Pro SW 80ED APO Refractor Assembly US $649.00
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 William Optics Megrez 72mm f 6 Apo Refractor w DDG US $579.00
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 Celestron Sky Watcher Pro 80ED APO Refractor Telescope US $649.00
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 Celestron Sky Watcher Pro 100ED APO Refractor Telescope US $749.00
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Orion EON 120mm f/7.5 ED Apochromatic Refractor Telescope
Sale Price: $1,599.99 |
DescriptionThe EON 120ED's optics consist of a fully multi-coated, air-spaced 120mm objective doublet lens of exceptional quality, containing one element of FPL-53 extra-low dispersion -- ED -- optical glass. The ED glass virtually eliminates the color fringing around bright objects resulting from chromatic aberration. Images are crisp, sharp, and color-pure, even at high magnification. The big 120mm objective has a 900mm focal length (f/7.5). Baffles inside the optical tube, glare threads in the focuser drawtube, and a retracting lens shade/dew shield eliminate unwanted glare. Like all EON telescopes, the 120ED has a beautifully machined Crayford-type 2" focuser with a removable 1.25" insert, allowing use of either 2" or 1.25" accessories. The gearless Crayford design provides smooth, zero image-shift focusing. The dual-speed focusing knobs have an 11:1 micro-focusing ratio. The focuser is rotatable 360 degrees, allowing comfortable eyepiece positioning or easy image framing when you're taking pictures. A dovetail finder scope base comes standard and accommodates any Orion finder scope or EZ Finder. The EON 120ED comes with two hinged tube rings and a dovetail mounting plate. Also included are an aluminum objective lens cap and a sturdy, aluminum-clad carrying case with custom foam interior and carrying handle. Weighs 14 lbs., 9 oz. One-year limited warranty. Features
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NightWatch: A Practical Guide to Viewing the Universe
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DescriptionThoroughly revised, updated and expanded. The first three editions of NightWatch sold more than 600,000 copies, making it the top-selling stargazing guide in the world for the last 20 years. The key feature of this classic title is the section of star charts that are cherished by backyard astronomers everywhere. Each new edition has outsold the previous one because of thorough revisions and additional new material. NightWatch has been acclaimed as the best general interest introduction to astronomy. The fourth edition has improvements over the 3rd edition in every chapter, including: The famous charts, ideal for stargazers using a small telescope or binoculars A complete update of the equipment section, including computerized telescopes An enlarged photography section, including how-to instructions for using the new generation of digital cameras for astronomical photography, both with and without a telescope The tables of future solar and lunar eclipses, planetary conjunctions and planet locations, updated through 2018. This edition includes for the first time star charts for use in the southern hemisphere. There are also dozens of new photographs throughout the book that show the latest thrilling discoveries made by current space observatories and probes. (20061217) Features
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The Backyard Astronomer's Guide
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DescriptionThe modern classic, completely updated. The newest edition of The Backyard Astronomer's Guide includes the latest data and answers the questions most often asked by home astronomers, from beginners to experienced stargazers. Terence Dickinson and Alan Dyer provide expert guidance on the right types of telescopes and other equipment; photographing the stars through a telescope; and star charts, software and other references. They cover daytime and twilight observing, planetary and deep-sky observing, and much more. With over 500 color photographs and illustrations, The Backyard Astronomer's Guide is one of the most valuable, beautiful and user-friendly astronomy books ever produced. New and updated for this edition: A 20-page full-color Atlas of the Milky Way provides location and context for hundreds of celestial objects mentioned throughout the book. A chapter on Astrophotography with Digital Cameras specifies what equipment works best and how to use it to collect a color gallery of celestial portraits. Telescopes for Recreational Astronomy features assessments of a wide range of new telescopes, from models for beginners to those for veteran astronomy enthusiasts, with special emphasis on computerized telescopes and how they work. Accessory Catalog spotlights the best of the accessories and flags the frivolous and irrelevant. Three practical appendices: Polar Aligning Your Telescope; Optics Cleaning and Collimation; Testing Your Telescope Optics. Any serious home astronomer must have this superb guide as an ongoing reference. (200308) |
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Star Ware: The Amateur Astronomer's Guide to Choosing, Buying, and Using Telescopes and Accessories
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DescriptionPraise for Star Ware"Star Ware is still a tour de force that any experienced amateur will find invaluable, and which hardware-minded beginners will thoroughly enjoy."- Robert Burnham, Sky & Telescope magazine"Star Ware condenses between two covers what would normally take a telescope buyer many months to accumulate."- John Shibley, Astronomy magazineWhether you're shopping for your first telescope or your fifth, don't be surprised if you feel overwhelmed by the dazzling array of product choices, bells and whistles, and the literature that describes them all. That's why you need Star Ware.In this revised and updated Fourth Edition of the essential guide to comparing and selecting sky-watching equipment, award-winning astronomy writer Philip Harrington takes you telescope shopping the easy way. He analyzes and explains today's astronomy market and compares brands and models point by point. Star Ware gives you the confidence you need to buy the telescope and accessories that are right for you and the knowledge to get the most out of your new purchase, with:*Extensive, expanded reviews of leading models and accessories-including dozens of new products*A clear, step-by-step guide to every aspect of selecting telescopes, binoculars, filters, mounts, lenses, cameras, film, star charts, guides and references, and much more*Ten new do-it-yourself projects for building your own astronomical equipment*Easy tips on setting up, using, and caring for telescopes and other astronomical equipment*Lists of where to find everything astronomical, including Web sites and resources; distributors, dealers, and conventions; and corporate listings for products and services |
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BARSKA Magnus ED 560x80 Refractor Telescope with Hard Case
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DescriptionMax power: 93.33x, Focal Length (mm) 560, Focal Ratio: 7 Eyepiece: PL6mm, 8-24, Diagonal 2" 90° Features
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BARSKA Magnus ED 390X65 Refractor Telescope with Hard Case
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DescriptionMax power: 65x, Focal Length (mm) 390, Focal Ratio: 6 Eyepiece: PL6mm, 8-24, Diagonal 1.25" 90° Features
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Celestron 52303 Regal Refractor 100mm F-ED Spotting Scope
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Description100MM (3.1-Inch) diameter 45⁰ angled APO refracting spotting scope. Waterproof 540MM focal length (f/5.4) Fully multi-coated optics Low dispersion fluoro ED glass Features
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Tele Vue NEW Up-Dated NP127is Imaging System 5" f/5.2, 4-Element APO Refractor Telescope Optical Tube Assembly, Ivory, New 10:1 focuser pinion assembly made for Tele Vue by Starlight Instruments. New lens prescription delivers smaller spots sizes over a broader wavelenght range.
List Price: |
DescriptionConcept: CCD cameras have challenged telescope optics beyond anything ever placed at the focal plane. Tele Vue knew it's APO objectives were up to the challenge, & with the proper tweaks would be extraordinary tools for the imager. With Tele Vue Imaging System (is) telescopes, they have refined their instruments & optional equipment beyond anything a CCD chip has seen.For 25 years, Tele Vue has pushed the boundaries of APO refractors, & eyepieces, to the recognized pinnacle of performance. They were gratified but not surprised that Backyard Astronomer's Guide said of the NP101: "optics don't get any better than this." No wonder "Sky and Telescope" rated the NP101 tops & selected it as the test instrument for its landmark review of the SBIG STL-11000 CCD camera. The "is" versions of the Tele Vue- 60, 102i, NP101 & NP127 retain the exemplary wide field & planetary visual capability while adding new features to make imaging easier & more flexible.Tele Vue-NP101is Tele Vue-NP127is:Tele Vue was determined to make the NP series optically, mechanically, & functionally as perfect as possible for imaging up to 50mm diagonal chips with o ut penalty to its near ideal visual operation.How? By applying the developments created for the Tele Vue-60is to the new NP101is and NP127is & then going beyond. The NP101 (540mm, f/5.4, 4") & NP127 (660mm, f/5.2, 5") maintain their optical specifications yet with redesig Features
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Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Sale Price: $499.99 |
DescriptionWe love those premium apo refractors as much as the next guy. We just don't think you should have to work a second job or put the family heirlooms on eBay to own one. Now you won't, thanks to our amazingly affordable 80mm ED refractor. Its multi-coated 80mm objective doublet contains one element crafted from extra-low-dispersion FPL-53 glass. Images are virtually free of chromatic aberration! With a focal length of 600mm (f/7.5), the "ED80" is wonderfully suited for visual applications on both solar system and deep-sky objects as well as for prime-focus astrophotography and CCD imaging. Sold as optical tube assembly only, without accessories. Finished in gunmetal gray metallic enamel. Compatible tube rings are #7371, sold separately. One-year limited warranty. I have been looking for quick "setup and go" telescope of superior quality for a few years, and I believe I have found that scope in the Orion 80ED. This is an amazingly compact, well performing little instrument that combines all the features I have been looking for in a single package. The only word for the optics is superb. When using the Orion 80ED to view the Moon and Planets, with magnifications at or below "Dawes Limit" (a theoretical limit to the maximum power of any telescope, 160 power in this case), I saw no false color of any kind. The contrast was excellent, and the views of the Moon and planets were tack sharp. As I increased the power beyond "Dawes Limit," I noted only the slightest hint of false color, a very slight drop in contrast, and the tiniest softening of the image. Saturn looks like a small ringed jewel sitting on black velvet, the cloud belts of Jupiter are clear colorful and sharp, and the Moon is nothing short of amazing. Deep Sky Objects show well with this instrument as well--I was able to easily see structure in the Great Nebula in Orion, and detail in the Andromeda Galaxy. The Optical Tube Assembly (OTA), is one hundred millimeters in diameter, a bit larger than most instruments of this size. The focuser is a 2" aluminum Crayford-type focuser that accepts 2" or 1 ¼" eyepieces or accessories. I can use a 2" eyepiece for a wider field of view than I would normally get using the standard 1 ¼" eyepiece, this makes for fine viewing of extended objects such as Nebula and Open Star Clusters. The focusing mechanism is smooth and silky, and incorporates a focus lock along the bottom of the focuser assembly. The rubber coated 42 mm (1.6") focus control knobs on each side of the drawtube make for a good grip and easy control of focus during photography or viewing. The telescope focuser easily supports a 35-MM camera or an ST-7 CCD camera using an optional T-Ring and two-inch adapter. The Dew shield is removable; this shortens the telescope's overall length from 23" to 18.75" which makes for easy storage and portability. A set of mounting rings is available from Orion as well as from third party vendors, allowing me to quickly mount the telescope on either a small Equatorial platform, or piggyback it on my much larger Nexstar11GPS telescope. This little telescope is built well, looks nice, performs well, and is small enough to take on the road. --Dave Cole Pros Small and lightweight Affordable Superb optics Well constructed 1 ¼" eyepiece adapter included Cons Tripod mounting block could be a bit larger Aperture is only 80 mm Does not come with a carry case Features
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