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10 (250mm) aperture, f/8 Ritchey-Chretien optical tube optimized for astrophotographic use with APS-C and full-frame (35mm) CCD cameras and DSLRs. • For our US and Canadian customers - http://bit.ly/2bdagmM • Unlike conventional Newtonian reflector and Schmidt Cassegrain (SCT) designs that are susceptible to displaying coma away from the center of the field, the acclaimed Ritchey-Chrétien design utilizes hyperbolic primary and secondary mirrors to achieve wonderfully flat images that are virtually coma-free with pinpoint star clarity all the way out to the field edge. Plus, since there are no lenses in an RC telescope, captured images are delightfully free of chromatic aberrations for true-color performance. Both the primary and secondary mirrors of the Orion 10 RC are made of low-expansion quartz glass and feature enhanced aluminum coatings to provide 96% reflectivity with a protective quartz overcoat. The primary mirror of the Orion 10 Ritchey-Chrétien is fixed in-place to eliminate annoying image shift that plague Schmidt-Cassegrain telescopes which can wreak havoc during imaging sessions. The secondary mirror is precisely center-marked to facilitate collimation. The 10 enameled steel optical tube is fortified with 8 internal, computer-positioned, knife-edge light baffles; and both the primary mirror tube and secondary mirror light shield are also highly baffled to ensure maximum image contrast. All these elements come together to make this 10 Ritchey-Chrétien Astrograph an ideal instrument for capturing bright and detailed images of deep-space objects with APS-C and full-frame (35mm) CCD cameras and DSLRs. • The Orion 10 Ritchey-Chrétien Astrograph features a huge, 3.3 dual-speed (10:1) modified Crayford focuser with a sturdy linear track bearing which provides rigid, backlash-free support of hefty imaging cameras and accessories. An engraved millimeter scale on the focuser drawtube allows easy focus point repeatability, and the focuser provides 139.6mm of backfocus travel from the 2 collar (243.9mm from the rear cell) to accommodate imaging accessory trains. One 2 and two 1 machined focus extension rings are included so you can adjust focus position for various imaging cameras and accessories. • This video provides an overview of our 10 Ritchey-Chrétien Astrograph. • View our complete selection of Astrophotography Telescopes: http://bit.ly/2aDQ3lC • To be notified when new videos are added to our growing library of stargazer how-to videos, subscribe to the Orion channel! • / oriontelescopes • 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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