User manual ORION TELESCOPES & BINOCULARS 09026

[. . . ] INSTRUCTION MANUAL Orion Skywatcher 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. Box 1815, Santa Cruz, CA 95061 IN 124 Rev. B 1099 Tube rings Objective lens cell Dew cap/ lens shade Declination lock lever Right Ascension slow-motion control Latitude adjustment T-bolts Large counterweight Small counterweight Eyepiece Star diagonal Focus knob Counterweight shaft "Toe saver" retaining bolt Counterweight lock thumbscrews Azimuth fine adjustment knobs Tripod leg Declination slow-motion control Polar axis finder scope Right Ascension lock lever Finder scope Finder bracket Accessory tray bracket Accessory tray Accessory tray bracket attachment point Leg lock knob Figure 1. The SkyView 120 EQ Refractor 2 Congratulations on your purchase of a quality Orion telescope! [. . . ] Center the star in the telescope's eyepiece. Loosen the large setscrew just above the R. A. setting circle so the pointer indicates the R. A. coordinate listed for the bright star in the star atlas. Do not retighten the setscrew when using the R. A. 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. lock knob and rotate the telescope until the Dec. value from the star atlas matches the reading on the Dec. Note: If the telescope is being aimed toward the south and the Dec. setting circle pointer passes the 0° indicator, the value on the Dec. setting circle becomes a negative number. lock lever and rotate the telescope until the R. A. value from the star atlas matches the reading on the R. A. 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. The counterweight shaft is oriented downward. 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. [. . . ] 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. [. . . ]