User manual ORION TELESCOPES & BINOCULARS ASTROVIEW 100

[. . . ] INSTRUCTION MANUAL Orion AstroView 100 EQTM ® #9862 100mm Equatorial Refracting 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 191 Rev. A 07/02 Finder scope Tube mounting rings Finder scope bracket Objective lens Eyepiece Star diagonal Tube ring attachment knobs Counterweight shaft Counterweight Counterweight lock knob "Toe saver" Latitude scale Tripod leg Latitude adjustment T-bolts Accessory tray bracket Right Ascension (R. A. ) slow-motion control cable Polar axis finder scope Focus knob Declination slow-motion control cable Accessory tray Leg lock knob Figure 1. The AstroView 100 EQ Reflector. 2 Welcome to the exciting world of amateur astronomy! [. . . ] Calibrating the Right Ascension Setting Circle 1. Identify a bright star in the sky near the celestial equator (Dec. = 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 cables. setting circle lock thumbscrew (see Figure 9); this will allow the setting circle to rotate freely. Rotate the setting circle until the arrow under the thumbscrew indicates the R. A. coordinate listed in the star atlas for the object. Do not retighten the thumbscrew when using the R. A. setting circles for finding objects; the thumbscrew is only needed for polar alignment using the polar axis finder scope. Finding Objects With the Setting Circles Now that both setting circles are calibrated, look up in a star atlas the coordinates of an object you wish to view. lock lever and rotate the telescope until the Dec. value from the star atlas matches the reading on the Dec. setting circle are positive when the telescope is pointing north of the celestial equator (Dec. = 0°), and negative when the telescope is pointing south of the celestial equator. lock lever and rotate the telescope until the R. A. value from the star atlas matches the reading on the R. A. Remember to use the upper set of numbers on the R. A. Most setting circles are not accurate enough to put an object dead-center in the telescope's eyepiece, but they should place the object somewhere within the field of view of the finder scope, assuming the equatorial mount is accurately polar aligned. Use the slow-motion controls to center the object in the finder scope, and it should appear in the telescope's field of view. setting circle must be re-calibrated every time you wish to locate a new object. [. . . ] Do not store the telescope outdoors, although storage in a garage or shed is OK. Small components like eyepieces and other accessories should be kept in a protective box or storage case. Keep the dust cover on the front of the telescope when it is not in use. Your AstroView100 EQ requires very little mechanical maintenance. [. . . ]