User manual ORION TELESCOPES & BINOCULARS SKYVIEWPRO 127MM EQ

[. . . ] INSTRUCTION MANUAL Orion SkyView Pro 127mm EQ TM ® #9877 Equatorial Maksutov-Cassegrain 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 215 Rev. A 11/02 Optical tube Finder scope Finder scope bracket Declination lock lever (opposite side) Right Ascension lock lever (opposite side) Declination slow-motion control knob Safety thumbscrew Mounting plate securing knob Eyepiece Star diagonal Focus knob (not shown) Counterweight shaft Counterweights Right ascension slow-motion control knob Right ascension axis rear cover Latitude scale Counterweight lock knobs Latitude adjustment L-bolts Center support shaft Tripod support tray Tripod leg Leg lock knobs Figure 1. The SkyView Pro 127mm EQ. 2 Congratulations on your purchase of an Orion telescope. [. . . ] setting circle (Figure 11) 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. setting circle, this will allow the setting circle to rotate freely. setting circle until the pointer reads exactly 90°. Retighten the setting circle thumbscrew. Dec. setting circles. 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. Center the star in the telescope's field of view with the slow-motion control knobs. setting circle thumbscrews; this will allow the setting circle to rotate freely. Rotate the setting circle until the R. A. coordinate listed in the star atlas for the object. Re-tighten the setting circle thumbscrew. [. . . ] Also keep the finder scope caps on if you leave it attached to the optical tube. Cleaning the Tube Your SkyView Pro 127mm EQ telescope requires very little mechanical maintenance. The optical tube is aluminum and has a smooth painted finish that is fairly scratch-resistant. If a scratch does appear on the tube, it will not harm the telescope. [. . . ]