User manual ORION TELESCOPES & BINOCULARS 09802

[. . . ] INSTRUCTION MANUAL Orion Observer 70mm EQ ® TM #9802 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 0898 Tube rings Tube ring clamps Objective lens Dew shield Tube ring mounting bolt Declination setting circle Right ascension lock knob (hidden) Counterweight shaft Counterweight Counterweight lock knob Retaining washer and screw Azimuth lock knob (hidden) Tripod leg attachment bolt Accessary tray bracket Accessory tray Tripod leg Finder scope Finder scope bracket Finder scope alignment screws (3) Focuser drawtube Eyepiece Star diagonal Focus knob Declination slow-motion control Declination lock knob Latitude lock knob (hidden) Latitude scale Right ascension setting circle Right ascension slow-motion control Leg lock thumbscrew Figure 1. Observer 70 EQ Parts Diagram 2 Congratulations on your purchase of a quality Orion telescope. Your new Observer 70 EQ Refractor is designed for high-resolution viewing of astronomical objects. [. . . ] If at all possible, escape the light-polluted city sky and head for darker country skies. You'll be amazed at how many more stars and deep-sky objects are visible in a dark sky!Cooling the Telescope All optical instruments need time to reach "thermal equilibrium. " The bigger the instrument and the larger the temperature change, the more time is needed. Allow at least a half-hour for your telescope to cool to the temperature outdoors. In very cold climates (below freezing), it is essential to store the telescope as cold as possible. If it has to adjust to more than a 40° temperature change, allow at least one hour. R. A. ­5° 27' That's 5 hours and 35. 4 minutes in right ascension, and ­5 degrees (5 degrees south of the celestial equator) and 27 minutes in declination. Before you can use the setting circles to locate objects, they must first 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. 6 Aiming the Telescope To view an object in the main telescope, first loosen both the R. A. Aim the telescope at the object you wish to observe by "eyeballing" along the length of the telescope tube (or use the setting circles to "dial in" the object's coordinates). Then look through the (aligned) finder scope and move the telescope tube until the object is centered on the crosshairs. The object should now be visible in the main telescope with a low-power (long focal length) eyepiece. Focusing the Telescope Practice focusing the telescope in the daytime before using it for the first time at night. Start by positioning the focuser near the center of its adjustment range. Make sure the knurled focus lock knob on the top of the focuser housing is loosened, to allow the drawtube to move freely. Point the telescope at a distant subject and get it in the field of view. Now, slowly rotate one of the focusing knobs until the object comes into sharp focus. Go a little bit beyond sharp focus until the image just starts to blur again, then reverse the rotation of the knob, just to make sure you hit the exact focus point. As with all refractor telescopes used with a standard 90° star diagonal, the image you see will be right-side up, but reversed left-to-right. (Correct-image diagonals are available, and may be purchased separately, though the image quality is slightly reduced. ) Do You Wear Eyeglasses?If you wear eyeglasses, you may be able to keep them on while you observe, if your eyepieces have enough "eye relief" to allow you to see the whole field of view. [. . . ] Store it in a clean, dry, dust-free place, safe from rapid changes in temperature and humidity. 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 objective lens cap on the front of the telescope when it is not in use. [. . . ]