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Features of the Orion 8Inch RitcheyChretien Astrograph Orion Telescopes
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Please see the latest, high-resolution version of this product video here: • Features Orion 8 Ritchey-Chrétien As... • 8 (200mm) aperture Ritchey-Chretien optical tube ideal for use with DSLR cameras and small-format CCDs to produce wonderfully flat, virtually coma-free astrophotos. • For our US and Canadian customers - http://bit.ly/1TuFAvH • This 8 (203mm) aperture RC combines the highly regarded Ritchey-Chrétien optical design with excellent light-gathering capability, high-end features, and durable construction to provide astrophotographers with an exceptional instrument at an amazing value. Unlike conventional Newtonian reflector and Schmidt-Cassegrain designs that are susceptible to coma away from the center of the field, the Orion 8 Ritchey-Chrétien Astrograph optical tube utilizes hyperbolic primary and secondary mirrors, made of low-expansion quartz glass, to achieve wonderfully flat-field images that are virtually devoid of coma with pinpoint star clarity. Plus, since there are no lenses in an RC telescope, captured images are delightfully free of chromatic aberrations for true-color performance. • The enameled steel Orion 8 Ritchey-Chrétien optical tube is fortified with 9 internal, computer-positioned knife-edge light baffles; and both the primary mirror tube and secondary mirror light shield are highly baffled to ensure maximum image contrast for bright images rich in detail. Unlike Schmidt-Cassegrains, the primary mirror of the 8 Ritchey-Chrétien telescope is fixed in-place to eliminate annoying image shift that can wreak havoc during imaging sessions. Enhanced aluminum coatings on both the primary and secondary mirrors of the 8 Ritchey-Chrétien Astrograph provide 96% reflectivity with a protective quartz overcoat. Designed with collimation in mind, the secondary mirror of the 8 RC is precisely center-marked to facilitate collimation adjustments should they become necessary. • The Orion 8 RC Astrograph features a machined, dual-speed (10:1) Crayford focuser equipped with a sturdy linear-bearing mechanism for enhanced rigidity and stable support of heavy astrophotography equipment. The rock-solid focuser provides 140.7mm of backfocus travel (238.1mm from the rear cell) to easily accommodate imaging accessory trains, and an engraved millimeter scale on the drawtube enables easy focus point repeatability. One 2 and two 1 machined focus extension rings are included so you can adjust focus position for various imaging cameras and accessories. Two dovetail finder scope bases positioned on either side of the focuser allows easy installation of optional Mini Guide Scopes and aiming devices (sold separately). The 8 Ritchey-Chrétien tips the scales at 18.5 lbs. and is equipped with a wide Losmandy-style dovetail bar along its underside for easy attachment to large equatorial mounts. A unique, Orion-exclusive slotted narrow dovetail bar along the top of the telescope allows easy attachment of optional guide scopes and other imaging accessories. • This video provides an overview of our 8 Ritchey-Chrétien Astrograph. • We offer many other Astrophotography Telescopes, several of which are described in these videos: • Features Orion 10 Ritchey-Chrétien Astrograph - Orion Telescopes • • Features Orion 10 Ritchey-Chrétien A... • Features Orion 6 Ritchey-Chrétien Astrograph - Orion Telescopes • https://www.youtube.com/watch?v=43FFs... • View our complete selection of Astrophotography Telescopes: http://bit.ly/1TuGI2o • To be notified when new videos are added to our growing library of stargazer how-to videos, subscribe to the Orion channel! • / oriontele. . • Visit http://www.telescope.com to find high quality products for amateur astronomers. • If you have any questions about any of our telescopes, binoculars, or accessories, please don't hesitate to contact one of our trained and knowledgeable customer service representatives. • http://www.telescope.com/custserv/con... • To learn more about Astronomy, please visit the Orion community where you can find Articles, Images, Videos and More! • http://www.telescope.com/catalog/comm... • Since 1975 Orion Telescopes Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all. Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you.
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