User manual ORION TELESCOPES & BINOCULARS REV B 9386 ST 80

[. . . ] INSTRUCTION MANUAL Orion® ShortTubeTM 80 80mm Rich-Field Refracting Telescope #9386 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 121 Rev. B 04/02 Welcome to a new world of adventure!-Your Orion ShortTube 80 is a fine-quality instrument designed for both daytime terrestrial viewing and nighttime stargazing. [. . . ] If the view is blurry, adjust the focus with the focus wheel until the image appears sharp. For higher magnification, switch to the 10mm eyepiece and readjust the focus as necessary. Remember, increasing the magnification decreases the field of view and the image brightness. Additional eyepieces can be purchased to obtain a greater range of magnifications. Astronomical Viewing The ShortTube 80 excels for astronomical observation. Its unobstructed 80mm aperture and short 400mm focal length (f/5) provide bright, expansive views of star fields and celestial objects residing within our solar system and beyond. The ShortTube 80 can show much more than what is visible on Earth during the day. Once the Sun sets, there are literally thousands of objects in the night sky that can be inspected more closely. For astronomical usage, we recommend a 90° star diagonal instead of the 45° correct-image diagonal that comes with the telescope. The correct-image diagonal is designed for daytime use, and will cause some degradation of image quality when used for astronomy. Also, the viewing angle provided by a 90° star diagonal is more comfortable for looking up. When using a star diagonal, the image in the eyepiece will appear backwards (inverted left-to-right). For casual stargazing, an altazimuth mount mount will do the job just fine. But an equatorial mount, is designed to make it easier to manually "track" the motion of celestial objects with just one slow-motion cable. Furthermore, with an equatorial mount you can add an optional motor drive to track the stars automatically--a great convenience. When selecting a location for nighttime stargazing, make it as far away from city lights as possible. Light-polluted skies greatly reduce what can be seen with the telescope. Also, give your eyes at least 20 minutes to dark-adapt to the night sky. You'll be surprised at how many more stars you will see!Use a red flashlight to see what you're doing at the telescope, or to read star charts. Red light will not spoil your dark-adapted night vision as readily as white light will. To find celestial objects with your telescope, you first need to become reasonably familiar with the night sky. Unless you know how to recognize the constellation Orion, for instance, you won't have much luck locating the Orion Nebula. [. . . ] You may want to consider using a remote shutter release instead of the shutter release on the camera. Touching the camera can vibrate the system and blur the resulting photographic image. Also, be sure to use a solid tripod. Any quality optical lens tissue and cleaning fluid specifically designed for multi-coated optics can be used to clean the telescope's objective lens as well as the lenses of the eyepieces and finder scope. Never use regular glass cleaner or cleaning fluid designed for eyeglasses. [. . . ]