{"product_id":"orion-08267-ritchey-chretien-8-inch-f-8-optical-tube-assembly-white","title":"8 inch f\/8 Optical Tube Assembly T557071","description":"The Orion 8 inch Ritchey-Chretien Astrograph's outstanding optical design lets you capture spectacular, detailed images of deep-sky objects like never before. Unlike conventional Newtonian reflector and Schmidt-Cass grain designs that are susceptible to coma away from the center of the field, the Ritchey-Chretien utilizes hyperbolic primary and secondary mirrors, made of BK-7 optical glass, to achieve wonderfully flat-field images that are virtually coma-free. Images are also free from chromatic aberration, since there are no lenses. The Orion 8 inch Ritchey-Chretien Astrograph is ideal for use with small CCD-chip cameras such as the Orion Star Shoot line, as well as medium-format CCD and DSLR cameras. The telescope's wide, fully illuminated flat field produces pinpoint star clarity all the way to the edge of the camera's sensor. The Orion 8 inch Ritchey-Chretien Astrograph features a machined, dual-speed (10:1) Crawford-style focuser with an engraved millimeter scale on the drawtube. The secondary mirror is precisely center-marked to facilitate collimation. The enameled steel optical tube weighs only 18.5lbs. and features a Losmandy-style dovetail mounting bar underneath for trouble-free setup on medium or large-sized equatorial mounts. The inside of the optical tube is fortified with eight computer-positioned light baffles, and the primary mirror baffle tube and secondary mirror light shield are also highly baffled to ensure maximum image contrast.","brand":"My Store","offers":[{"title":"Default Title","offer_id":47424526549165,"sku":"P353532306226548809","price":32.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/5634\/9101\/files\/e0155f8ab5f27ebe2fb573a0015ed5c59286fe48e5f140278fbfbaec929e3ef1.jpg?v=1788774869","url":"https:\/\/arozora.shop\/products\/orion-08267-ritchey-chretien-8-inch-f-8-optical-tube-assembly-white","provider":"My Store","version":"1.0","type":"link"}