INSTRUCTION MANUAL Orion 8" and 10" f/3.9 Newtonian Astrographs #8297 8" f/3.9, #8296 10" f/3.9 #8296 Providing Exceptional Consumer Optical Products Since 1975 OrionTelescopes.com Customer Support (800) 676-1343 • E-mail:
[email protected] Corporate Offices (831) 763-7000 • 89 Hangar Way, Watsonville, CA 95076 © 2011 Orion Telescopes & Binoculars IN 406 Rev. A 07/11 2" Finder scope Accessory bracket collar 9x50 Finder Scope Optical tube Tube rings Focus wheel Drawtube Fine focus wheel tensioning thumbscrew Focus wheel Figure 1. The Orion 8" f/3.9 Newtonian Astrograph Congratulations on your purchase of an Orion f/3.9 Newtonian Astrograph! These powerful imaging telescopes feature “fast,” high-quality parabolic optics, a 2" dual-speed Crayford focuser, and excellent mechanical construction with some special features. Optimized for astrophotography with DSLR and astronomical CCD imaging cameras, our f/3.9 Newtonian Astrographs are capable of delivering breathtak- ing imaging performance – for beginning to advanced astrophotographers. This instruction manual covers both the 8" and 10" mod- Parts List els of f/3.9 Newtonian astrograph. Although they differ • Optical tube assembly in aperture and focal length, physical size, and weight, they are otherwise very similar in mechanical construc- • Optical tube dust cap tion and features. So we will use the 8" model to illus- • 1.25" eyepiece holder trate the features of both astrographs. Any exceptions • 9x50 finder scope with bracket related to the 10" model will be noted. • Pair of hinged tube rings This instruction manual will help you to set up and • 2" thread-on extension adapter, 30mm properly use your telescope.