User manual ORION TELESCOPES & BINOCULARS 09408

[. . . ] INSTRUCTION MANUAL Orion SkyView Deluxe 8" EQ ® TM Equatorial Reflecting Telescope #9408 Customer Support (800) 676-1343 E-mail: support@telescope. com Corporate Offices (831) 763-7000 Providing Exceptional Consumer Optical Products Since 1975 P. O. Box 1815, Santa Cruz, CA 95061 Finder scope alignment screws (6) Finder scope Finder scope bracket Secondary mirror holder Eyepiece Focuser Focus knob Declination slowmotion control Tube ring clamps Tube ring Declination setting circle Declination lock lever (not visible) Latitude lock lever (not visible) Counterweight shaft Counterweight Counterweight lock knob Retaining nut Azimuth fine adjustment knobs (2) Tube ring mount bolts Primary mirror cell Spring-loaded collimation screws (3) (not visible) Right ascension lock lever Right ascension setting circle Polar axis finder scope Right ascension slow-motion control Latitude adjustment knob Tripod leg attachment bolt Latitude scale Accessory tray bracket Accessory tray Tripod leg Leg lock bolt Figure 1. SkyView Deluxe 8" parts diagram 2 Congratulations on your purchase of a quality Orion telescope. Your new SkyView Deluxe 8" EQ is designed for high-resolution viewing of astronomical objects. [. . . ] In fact, it almost never will! observing session. Proper collimation of the 8" SkyView Deluxe's optics is especially critical due the telescope's short focal length; even slight alignment errors will cause images at high magnifications to be significantly degraded. Collimation is easy to do, and should be done in daylight. To check the collimation, remove the eyepiece and look down the focuser drawtube. You should see the secondary mirror centered under the drawtube, the reflection of the primary mirror centered in the secondary mirror, and the reflection of the secondary mirror (and your eye) centered in the reflection of the primary mirror, as in Figure 8a. If anything is off-center, follow the collimation procedure below. It helps to put a piece of white paper on the inside of the optical tube opposite the focuser. The white paper forms a bright background behind the secondary mirror, making it easier to distinguish the mirror holder from the background. Use a Collimation Tool To aid in centering your line of sight down the focuser drawtube, and in centering the mirror reflections during collimation, it is very helpful to use a precision collimating tool containing crosshairs, such as the Orion Collimating Eyepiece #3640. We highly recommend that you purchase one. Aligning the Secondary Mirror With the eyepiece removed, look straight down the open focuser drawtube at the secondary (diagonal) mirror. Collimating the Optics (Aligning the Mirrors) Collimation is the process of adjusting the mirrors so they are precisely aligned with each other. Your telescope's optics were aligned at the factory, and should not need much adjustment unless the telescope was roughly handled during shipment. Accurate collimation is important to insuring the peak performance of your telescope, so it should be checked before each b. c. a. d. Figure 8. (a) When the mirrors are properly aligned, the view down the focuser drawtube should look like this. (b) If the optics are out of alignment, the view might look something like this. (c) Here, the secondary mirror is centered under the focuser, but it needs to be adjusted (tilted) so that the entire primary mirror is visible. (d) The secondary mirror is correctly aligned, but the primary mirror still needs adjustment. When the primary mirror is correctly aligned, the eye will be centered, as in (a). 10 tions for the time being. The secondary mirror should be centered in the field of view. If it isn't, as in Figure 8b, it must be adjusted. (It helps to adjust the secondary mirror in a brightly lit room with the telescope pointed toward a bright surface, such as white paper or a wall. ) If the secondary mirror is not centered in the focuser drawtube (in the direction parallel to the length of the telescope), loosen the three small alignment screws in the center hub of the secondary mirror holder several turns. [. . . ] Wipe the mirror under water with clean cotton balls, using extremely light pressure and stroking in straight lines across the surface. Use one ball for each wipe across the mirror. Then rinse the mirror under a stream of lukewarm water. Any particles on the surface can be swabbed gently with a series of clean cotton balls, each used 15 just one time. [. . . ]