![]() ![]() The atmosphere above us is constantly in motion, and it will distort the image seen through the telescope. So for example, an 80mm refractor is capable of 160x, and a 10" telescope is theoretically capable of 500x magnification.īut after approximately 300x, theory breaks down and real world problems take over. The "theoretical" limit generally is 50x the aperture of the scope in inches (2x the aperture in mm). The highest practical limit is different from the often used "highest theoretical magnification" specification. Referring to the manual is highly recommended. These products will appeal to the more technically inclined. Some are easy to use but might be on the large or heavy side. Optical instruments with this rating have exceptionally fine optics and mechanics. Referring to the manual is recommended.Īdvanced Level - These products provide the best performance but may require more skill to master and appreciate. But anyone with the slightest technical bent will have no problem getting familiar with these models. ![]() They typically take a bit longer to learn and need some set-up or adjustments. Intermediate Level - These products offer higher performance and more advanced features than Level 1: Beginner models. Beginning level telescopes will show you countless lunar craters, Saturn's rings and a myriad of star clusters and nebulae! Referring to the manual is recommended. Great for families, young people, and folks who don't want to mess with equipment and complexity. Optical instruments with this rating will have very good optical and mechanical quality. Some initial assembly may be required depending on the type of product. The end of the collar is even threaded with male T2 threads to allow threaded attachment of a DSLR directly to the focuser (with proper T-ring) for photography.īeginner Level - Suited for a wide range of uses, these products are simple to operate and set up. Another nice feature: the eyepiece holding collar on the focuser drawtube has two thumbscrews to ensure secure lockdown of your guide camera or diagonal. Its fixed aluminum dew shield extends a full 3-1/4" out from the objective lens to prevent dew formation and block off-axis glare. The ShortTube 80 Refractor Telescope Optical Tube Assembly measures 15" in length. Add your favorite telescope eyepieces, correct-image or mirror diagonal, and finder scope or reflex sight (all sold separately) and you'll have an instrument customized for adventure. Its multi-coated 80mm achromatic objective lens and short 400mm focal length are perfect for scanning vast vistas. You'll love this refractor telescope's bright, expansive views. Weighing well under 3 lbs., the ShortTube 80 OTA can easily be added to virtually any astrophotography rig without exceeding your equatorial mount's payload capacity. Its all-metal tube features a rack-and-pinion focuser with drawtube tension adjustment and a molded-in dovetail finder scope base that accepts optional Orion finder scopes. The fast f/5 achromatic optics provide a wide field of view that makes guide star acquisition a breeze. Sold without accessories, the ShortTube 80 Refractor Telescope Optical Tube Assembly is ideal for use as a dedicated guide scope for guided astrophotography pursuits. It's baack! The affordable optical tube assembly (OTA) version our Orion ShortTube 80 achromatic refractor telescope is back in our lineup, by popular demand.
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