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. 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. Your new SkyView Pro 120 EQ is designed for high-resolution viewing and astrophotography of astronomical objects. [. . . ] 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. 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. 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 is scaled in degrees, with each mark representing 2° increments. 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. lock lever and position the telescope as accurately as possible in declination so it is parallel to the R. A. setting circle (see Figure 11), this will allow the setting circle to rotate freely. 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. Center the star in the telescope's field of view with the slow-motion control knobs. setting circle thumbscrews (see Figure 11); this will allow the setting circle to rotate freely. 11 1. 9 4. 9 2. 4 1. 7 3. 4 2. 5 2. 4 a b 1. 9 Figure 13. [. . . ] Point the telescope at a dark target of uniform brightness, like a painted wall or a black piece of construction paper. You will also need a 2. 5mm hex key and a Phillips-head screwdriver. 10. 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 16 Pair of collimating screws (3) cleaning with fluid and tissue, however, blow any loose particles off the lens with a blower bulb or compressed air. [. . . ]