User manual ORION TELESCOPES & BINOCULARS 09024

[. . . ] INSTRUCTION MANUAL Orion Skywatcher 90mm EQ ® TM #9024 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 112 Rev. A 0399 Piggy back camera adapter Tube mounting rings Finder scope bracket Finder scope Tube ring mounting plate Dec. slow-motion control Counterweight locking thumbscrew Counterweight Counterweight shaft Latitude locking t-bolt Azimuth adjustment knob Eyepiece Star diagonal Focus knob Dec. [. . . ] Set up on a grass or dirt surface, not asphalt, because asphalt radiates more heat. Heat disturbs the surrounding air and degrades the images seen through the telescope. Avoid viewing over rooftops and chimneys, as they often have warm air currents rising from them. Similarly, avoid observing from indoors through an open (or closed) window, because the temperature difference between the indoor and outdoor air will cause image blurring and distortion. 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! Telescope F. L. = Magnification 7 For example, the Skywatcher 90 EQ, which has a focal length of 910mm, used in combination with a 25mm eyepiece, yields a power of Avoid looking over buildings, pavement, or any other source of heat, as they will cause "heat wave" disturbances that will distort the image you see through the telescope. Especially important for observing faint objects is good "transparency"--air free of moisture, smoke, and dust. All tend to scatter light, which reduces an object's brightness. Transparency is judged by the magnitude of the faintest stars you can see with the unaided eye (6th magnitude or fainter is desirable). How to Find Interesting Celestial Objects To locate 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, unless, or course, you look up its celestial coordinates and use the telescope's setting circles. Even then, it would be good to know in advance whether that constellation will be above the horizon at the time you plan to observe. A simple planisphere, or star wheel, can be a valuable tool both for learning the constellations and for determining which ones are visible on a given night at a given time. A good star chart or atlas will come in very handy for helping find objects among the dizzying multitude of stars overhead. Except for the Moon and the brighter planets, it's pretty timeconsuming and frustrating to hunt for objects randomly, without knowing where to look. You should have specific targets in mind before you begin observing. Start with a basic star atlas, one that shows stars no fainter than 5th or 6th magnitude. In addition to stars, the atlas will show the positions of a number of interesting deep-sky objects, with different symbols representing the different types of objects, such as galaxies, open star clusters, globular clusters, diffuse nebulas, and planetary nebulas. So, for example, your atlas might show a globular cluster sitting just above the lid of the "Teapot" pattern of stars in Sagittarius. You then know to point your telescope in that direction to home in on the cluster, which happens to be 6. 9-magnitude Messier 28 (M28). You can see a great number and variety of astronomical objects with your Skywatcher 90 EQ, including: The Moon With its rocky, cratered surface, the Moon is one of the easiest and most interesting targets to view with your telescope. [. . . ] The new finder scope bracket design also eliminates the need for knurled lock nuts on the alignment screws. Refer to Figure 1 to identify the parts of the new finder scope bracket. #9025 Explorer 90 AZ In the assembly section of the manual on page 4, line item 9 should now read: 9. To place the finder scope in the finder scope bracket, first unthread the two adjustment screws until the screw ends are flush with the inside diameter of the bracket. [. . . ]