User manual ORION TELESCOPES & BINOCULARS REV C 9029 EXPLORER

[. . . ] INSTRUCTION MANUAL Orion Explorer 90mm AZ ® TM #9029 Altazimuth 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 04/02 Piggyback camera adapter Tube mounting rings Finder scope Finder scope bracket Alignment screws (2) Tube ring mounting plate Azimuth lock knob (not shown) Eyepiece 45° Correct-image diagonal Focus knob Azimuth slow-motion control Accessory tray Altitude slow-motion control Accessory tray bracket attachment point Tripod leg lock knob Accessory tray bracket Figure 1. Explorer 90 AZ Parts Diagram 2 on your purchase of a quality Orion telescope. Your Explorer 90 Altazimuth Refractor is an excellent instrument for both terrestrial observation and astronomical viewing. [. . . ] Camera Attachment With an optional camera adapter, the Explorer 90 becomes a 910mm f/10 telephoto lens for a single-lens reflex camera. For long-distance terrestrial or astronomical photography, you need only a T-ring for your particular camera model. The T-ring attaches to your particular camera model and threads onto the Explorer 90's focuser drawtube, coupling the camera body to the telescope. Tighten the focus lock thumbscrew to make sure the camera does not slip out of focus. 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. 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. Make sure you are not looking over buildings, pavement, or any other source of heat, which will radiate away at night, causing "heat wave" disturbances that will distort the image you see through the telescope. Let Your Eyes Dark-Adapt Don't expect to go from a lighted house into the darkness of the outdoors at night and immediately see faint nebulas, galaxies, and star clusters--or even very many stars, for that matter. Your eyes take about 30 minutes to reach perhaps 80% of their full dark-adapted sensitivity. Many observers notice improvements after several hours of total darkness. As your eyes become dark-adapted, more stars will glimmer into view and you'll be able to see fainter details in objects you view in your telescope. Exposing your eyes to very bright daylight for extended periods of time can adversely affect your night vision for days. So give yourself at least a little while to get used to the dark before you begin observing. To see what you're doing in the darkness, use a red-filtered flashlight rather than a white light. Red light does not spoil your eyes' dark adaptation like white light does. A flashlight with a red LED light, or you can cover the front of a regular incandescent flashlight with red cellophane or paper. Beware, too, that nearby porch lights, streetlights, and car headlights will ruin your night vision. "Seeing" and Transparency Atmospheric conditions vary significantly from night to night. [. . . ] Don't expect these subjects to appear like the photographs you see in books and magazines; most will look like dim gray smudges. (Our eyes are not sensitive enough to see color in such faint objects. ) But as you become more experienced and your observing skills get sharper, you will be able to ferret out more and more subtle details. 7 Remember that the higher the magnification you use, the dimmer the image will appear. So stick with low power when observing deep-sky objects because they're already very faint. 6. Care and Maintenance If you give your telescope reasonable care, it will last a lifetime. [. . . ]