User manual ORION TELESCOPES & BINOCULARS REVC 9026 ASTROVW 120

[. . . ] INSTRUCTION MANUAL Orion AstroView 120 EQ ® TM #9026 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. C 0900 Tube rings Objective lens cell Dew cap/ lens shade Right Ascension slow-motion control (not visible) Declination lock lever Latitude adjustment T-bolts Counterweight shaft Small counterweight Large counterweight Finder scope Finder bracket Eyepiece Star diagonal Focus knob Declination slow-motion control Right Ascension lock lever Polar axis finder scope Counterweight lock thumbscrews "Toe saver" retaining bolt Azimuth fine adjustment knobs Tripod leg Accessory tray bracket attachment point Accessory tray bracket Accessory tray Leg lock knob Figure 1. The AstroView 120 EQ Refractor 2 Congratulations on your purchase of a quality Orion telescope!Your new AstroView 120 EQ Refractor is designed for high-resolution viewing of astronomical objects. [. . . ] The upper set of numbers apply to viewing in the Northern Hemisphere, while the numbers below them apply to viewing in the Southern Hemisphere. Before you can use the setting circles to locate objects, the mount must be accurately polar aligned, and the setting circles must be calibrated. The declination setting circle was calibrated at the factory, and should read 90° when the telescope optical tube is pointing exactly along the polar axis. Identify a bright star near the celestial equator and look up its coordinates in a star atlas. lock levers on the equatorial mount, so the telescope optical tube can move freely. setting circles for finding objects; the set screw 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. setting circle pointer passes the 0° indicator, the value on the Dec. Most setting circles are not accurate enough to put an object dead-center in your finder scope's field of view, but they'll get you close, assuming the equatorial mount is accurately polaraligned. setting circle should be recalibrated 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. One thing you DO NOT do is make any adjustment to the latitude adjusting T-bolts. 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. [. . . ] Do not "polish" or rub hard when cleaning the lens, as this will scratch it. The tissue may leave fibers on the lens, but this is not a problem; they can be blown off with a blower bulb. Never disassemble the telescope or eyepieces to clean optical surfaces! 10. Specifications Optical tube: Seamless aluminum Objective lens diameter: 120mm (4. 7") Objective lens: crown and flint, achromatic, air-spaced, diffraction limited Objective lens coating: fully coated with multi-coatings Focal length: 1000mm Focal ratio: f/8. 3 Eyepieces: 25mm and 10mm Plössls, fully coated, 1. 25" Magnification: 40x (with 25mm), 100x (with 10mm) Focuser: Rack and pinion, accepts 1. 25" or 2" accessories Diagonal: 90° star diagonal, mirror type, 1. 25" Finder scope: 6x magnification, 30mm aperture, achromatic, crosshairs Mount: German-type equatorial Tripod: Aluminum Motor drives: Optional 8. [. . . ]