Orion #8297 8" F/3.9 User Manual

INSTRUCTION MANUALIN 406 Rev. A 07/11Customer Support (800) 676-1343 • E-mail: [email protected] Offices (831) 763-7000 • 89 Hangar Way,

10of the three alignment set screws by, say, one full turn, and then tighten the other two to take up the slack (Figure 13). Do not loosen the center

11cap on the eyepiece opening. Keep the telescope inside the hard storage carrying case when not in use. Store it indoors or in a dry garage. Do not l

4. SpecicationsOrion 8" f/3.9 Newtonian AstrographOptical configuration: Newtonian reflectorAperture: 203mmFocal length: 800mmFocal ratio: f

2Congratulations on your purchase of an Orion f/3.9 Newtonian Astrograph! These powerful imaging telescopes feature “fast,” high-quality parabolic opt

3packaging to ensure the telescope stays intact during shipping. Take a moment to inspect the telescope and all of its parts.Before proceeding with th

4Attaching the Finder ScopeThe included 9x50 crosshair finder scope (Figure 3a) is use-ful for locating objects in the sky and centering them in the m

5Cooling the TelescopeAll optical instruments need time to reach “thermal equilibri-um.” The bigger the instrument and the larger the temperature chan

6Attaching a CCD CameraThe Orion f/3.9 Newtonian Astrographs are equipped to accept CCD cameras with a 2" nosepiece, or a 2" coma cor-rector

7cal tube in front of the focuser. Both the 8" and 10" models have added length in front of the focuser, compared to a stan-dard Newtonian,

8The Collimation CapYour f/3.9 Newtonian Astrograph comes with a “quick collima-tion cap” (Figure 9). This is a simple cap that fits on the fo-cuser d

9for the time being. The secondary mirror itself should be cen-tered in the focuser drawtube. If it is off-center along the axis of the telescope, i.e