User manual ORION TELESCOPES & BINOCULARS 09027

[. . . ] INSTRUCTION MANUAL Orion SpaceProbe 130mm EQ ® Equatorial Newtonian Reflector Telescope #9027 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 thumb screws(2) Spring -loaded tensioner Finder scope bracket Piggyback adapter Tube mounting rings Dovetail slot Eyepiece Focuser Dec. slow-motion control cable Tube ring clamps Primary mirror cell Dec. lock knob Counterweight Counterweight lock knob Counterweight shaft R. A. [. . . ] Turning the bolt clockwise will move the secondary mirror toward the front opening of the optical tube, while turning the bolt counterclockwise will move the secondary mirror toward the primary mirror. When the secondary mirror is centered in the focuser drawtube (as in Figure 8c), rotate the secondary mirror holder slightly side-to-side until the reflection of the primary mirror is as centered in the secondary mirror as it will get. Now tighten the three set screws to secure the secondary mirror in that position. Adjust the tilt of the secondary mirror by loosening or tightening the three alignment setscrews with a Phillips screwdriver. Adjusting the Primary Mirror The final adjustment is made to the primary mirror. It will need adjustment if, as in Figure 8d, the secondary mirror is centered under the focuser and the reflection of the primary mirror is centered in the secondary mirror, but the small reflection of the secondary mirror (with your eye inside) is off-center. The tilt of the primary is adjusted with the three pairs of collimation screws on the back end of the optical tube (bottom of the mirror cell, see Figure 11). The collimation screws can be turned with a Phillips head screwdriver. Figure 9. To center the secondary mirror under the focuser, hold the secondary mirror holder in place with one hand while adjusting the center bolt with a Phillips screwdriver. The three pairs of collimation screws adjust the tilt of the primary mirror. If the entire primary mirror reflection is not visible in the secondary mirror (as it is not in Figure 8c), adjust the tilt of the secondary mirror by alternately loosening one of the three set screws a turn and tightening the other two (Figure 10). The goal is to center the primary mirror reflection in the secondary mirror, as depicted in Figure 8d. Don't worry that the reflection of the secondary mirror (the smallest circle, with your eye reflected in it) is off-center (as also is the case in Figure 8d); you will fix that in the next step. Each pair of collimation screws work together to adjust the tilt. One screw pushes the mirror cell forward, while the other screw pulls the mirror cell back. One must be loosened and the other tightened by the same amount in order to adjust the tilt. Try tightening and loosening one of the pairs of Phillipsheaded collimation screws one turn. Look into the focuser and see if the secondary mirror reflection has moved closer to the center of the primary mirror reflection. Repeat this process on the other two pairs of collimation screws, if necessary. It will take a little trial and error to get a feel for how to tilt the mirror in this way to center the reflection. (It helps to 11 have two people for primary mirror collimation, one to look in the focuser while the other adjusts the collimation screws. ) The view down the focuser should now resemble Figure 8a. The secondary mirror is centered under the focuser; the reflection of the primary mirror is centered in the secondary mirror, and the reflection of the secondary mirror is centered in the reflection of the primary mirror. A simple star test will tell you whether the optics are accurately collimated. Star-Testing Your Telescope When it is dark, point the telescope at a bright star and center it in the eyepiece's field of view with the R. A. If the telescope is correctly collimated, the expanding disk should be a circle. [. . . ] These coatings normally last through many, many years of use before requiring re-coating (which is easily done). To clean the secondary mirror, remove the mirror in its holder from the 4-vaned spider in the tube. Do this by grasping the secondary mirror holder with your fingertips while turning the central bolt on the spider's central hub counterclockwise. Then follow the same procedure described below for cleaning the primary mirror. [. . . ]