User manual ORION TELESCOPES & BINOCULARS SVP 100 EQ

[. . . ] INSTRUCTION MANUAL Orion® SkyViewTM Pro 100 EQ #9864 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 190 Rev. A 09/02 Objective lens Tube rings Finder scope Declination lock lever (opposite side) Right Ascension lock lever (opposite side) Declination slow-motion control knob Safety thumbscrew Mounting plate securing knob Counterweight shaft Counterweight Counterweight lock knob Finder scope bracket Eyepiece 90° Star Diagonal Focus wheel Right Ascension slow-motion control knob Latitude scale Latitude adjustment L-bolts Center support shaft Tripod support tray Tripod leg Leg lock knobs Figure 1. The SkyView Pro 100 EQ. 2 ® Congratulations on your purchase of an Orion telescope. [. . . ] 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 counterweight 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. To point the telescope directly south, the counterweight shaft should again be horizontal. Then you simply rotate the scope on the declination axis until it points in the south direction. R. A. setting circle thumbscrew (2) Figure 11. setting circles. 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. setting circle, this will allow the setting circle to rotate freely. setting circle until the pointer reads exactly 90°. Retighten the setting circle thumbscrew. Calibrating the Right Ascension Setting Circle 1. Identify a bright star in the sky near the celestial equator (declination = 0°) and look up its coordinates in a star atlas. lock levers on the equatorial mount, so the telescope optical tube can move freely. Point the telescope at the bright star whose coordinates you know. [. . . ] Ignoring the tiny central reflection, you should see two separate reflections of the ring in the objective lens. If you see only one reflection, then your telescope is already collimated. Use the collimating screws in the lens cell to center the reflections on top of one another (Figure 16). There are three pairs of screws; each pair works together to tilt the lens. [. . . ]