User manual ORION TELESCOPES & BINOCULARS SVP 120 EQ

[. . . ] INSTRUCTION MANUAL Orion® SkyViewTM Pro 120 EQ #9867 Equatorial Refractor Telescope 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 IN 189 Rev. A 09/02 Objective lens Optical tube Tube rings Declination lock lever (opposite side) Right Ascension lock lever (opposite side) Declination slow-motion control knob Safety thumbscrew Mounting plate securing knob Counterweight shaft Counterweights Counterweight lock knobs Eyepiece Star diagonal Focus wheel Right Ascension slow-motion control knob Latitude scale Latitude adjustment L-bolts Center support shaft Finder scope Finder scope bracket Tripod support tray Tripod leg Leg lock knobs Figure 1. The SkyView Pro 120 EQ. 2 ® Congratulations on your purchase of an Orion telescope. [. . . ] DO NOT make any adjustment to the latitude adjustment Lbolts. That will spoil the mount's polar alignment. Remember, once the mount is polar aligned, the telescope should be moved only on the R. A. To point the scope overhead, first loosen the R. A. lock lever and rotate the telescope on the right ascension axis until the counterweight shaft is horizontal (parallel to the ground). lock lever and rotate the telescope until it is pointing straight overhead. The counterweight shaft is still horizontal. What if you need to aim the telescope directly north, but at an object that is nearer to the horizon than Polaris?You can't do it with the counterweights down as pictured in Figure 1. Again, you have to rotate the scope in right ascension so that the counterweight shaft is positioned horizontally. Then rotate the scope in declination so it points to where you want it near the horizon. R. A. setting circle thumbscrew (2) Figure 11. setting circle is scaled in degrees, with each mark representing 2° increments. Values of declination coordinates range from +90° to -90°. The 0° mark indicates the celestial equator. When the telescope is pointed north of the celestial equator, values of the declination setting circle are positive; when the telescope is pointed south of the celestial equator, values of the declination setting circle are negative. So, the coordinates for the Orion Nebula listed in a star atlas will look like this: R. A. ­5° 27' That's 5 hours and 35. 4 minutes in right ascension, and -5 degrees and 27 arc-minutes in declination (there are 60 arcminutes in 1 degree of declination). Before you can use the setting circles to locate objects, the mount must be accurately polar aligned, and the setting circles must be calibrated. Calibrating the Declination Setting Circle 1. lock lever and position the telescope as accurately as possible in declination so it is parallel to the R. A. Loosen one of the thumbscrews on the Dec. [. . . ] Wipe the lens gently in a circular motion, then remove any excess fluid with a fresh lens tissue. Oily fingerprints and smudges may be removed using this method. Use caution; rubbing too hard may scratch the lens. For the objective lens, clean only a small area at a time, using a fresh lens tissue on each area. [. . . ]