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. 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!Your new AstroView 100 EQ Reflector is designed for high-resolution viewing of astronomical objects. [. . . ] 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. 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. 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 so by calibrating the setting circle for the centered object before moving on to the next one. Beginners occasionally experience some confusion about how to point the telescope overhead or in other directions. In Figure 1 the telescope is pointed north as it would be during polar alignment. But it will not look like that when the telescope is pointed in other directions. Let's say you want to view an object that is directly overhead, at the zenith. Remember, once the mount is polar aligned, the telescope should be moved only on the R. A. axis until the counterweight shaft is horizontal (parallel to the ground). lock lever and rotate the telescope until it is pointing straight overhead. 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. To point the telescope directly south, the counterweight shaft should again be horizontal. axis until it points in the south direction. 10 a. b. c. d. Figure 10 This illustration shows the telescope pointed in the four cardinal directions (a) North, (b) South, (c) East, (d) West. Note that the tripod and mount have not been moved; only the telescope tube has moved on the R. A. axes To point the telescope to the east or west, or in other directions, you rotate the telescope on its R. A. Depending on the altitude of the object you want to observe, the counterweight shaft will be oriented somewhere between vertical and horizontal. Figure 10 illustrates how the telescope will look when pointed at the four cardinal directions: north, south, east and west. [. . . ] 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 14). Care and Maintenance If you give your telescope reasonable care, it will last a lifetime. Store it in a clean, dry, dust-free place, safe from rapid changes in temperature and humidity. [. . . ]