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Your 100mm f/9 ED has been designed with high quality optics and excellent mechanical construction. The ED glass in the objective lens means you’ll enjoy images with far less color distortion than those seen in a standard refractor, and the smooth Crayford focuser will make getting sharp images a breeze. These instructions will help you set up and use your telescope tube. Getting Started The 100mm f/9 ED comes fully assembled from the factory. The telescope’s optics have been installed and collimated, so you should not have to make any adjustments to them. Please keep the original shipping box! In the unlikely event you should need to ship the telescope back to Orion for warranty repair service, you should use the original packaging. The box also makes a very good container for storing the telescope when it is not in use. Attaching the Refractor to a Tripod or Mount Optional tube rings should be used to attach the scope to a telescope mount. Tube rings with an inner diameter of 100mm (3.9"), such as Orion item #7371, are needed. When using tube rings, you should first attach them to your telescope mount and then lay the optical tube in the tube rings. Use of Optional Eyepieces, Diagonal, and Finder Scope The 100mm ED does not come with a finder scope, diagonal or eyepieces in order to grant the user the greatest versatility in customizing the instrument to suit their tastes. However, certain rules for using accessories still apply. Any Orion finder scope with a dovetail bracket can be used with the 100mm f/9 ED. Simply unthread the thumbscrew on the dovetail mount (Figure 1) and insert the assembled finder scope and dovetail bracket. Retighten the thumbscrew. Finder scopes that do not use a dovetail bracket will need to be attached by other means. The 100mm ED can use almost any 1.25" diagonal and eyepiece. To install a diagonal, unthread the thumbscrew on the 1.25" adapter (Figure 1) until it is flush with the interior of the adapter. Insert the diagonal and secure it with the thumbscrew. Then insert the eyepiece into the diagonal and secure it with the thumbscrew. Use of 2" Eyepieces and Diagonals A feature of the 100mm ED is its ability to also use 2" barrel- diameter eyepieces and diagonals. At low magnifications, 2" eyepieces can give a wider field of view than standard 1.25" eyepieces. This is especially desirable for observing deep-sky objects, as many of them appear quite large, but faint. Please note that the 100mm ED will not reach focus with the 2" eyepieces unless a 2" diagonal or extension tube is used. Customer Support (800)-676-1343 E-mail: support@telescope.com Corporate Offices (831)-763-7000 P.O. Box 1815, Santa Cruz, CA 95061 Providing Exceptional Consumer Optical Products Since 1975 IN 247 REV A 5/04 To use 2" eyepieces, simply loosen the two large thumbscrews on the 2" adapter (Figure 1). Once these thumbscrews are loosened, the entire back end of the focuser, including any 1.25" diagonal and eyepiece that may be attached, comes off, exposing the 2" diameter focuser drawtube. Now, insert your 2" diagonal (or extension tube) into the drawtube and secure with the two thumbscrews loosened previously. Insert a 2" eyepiece into the diagonal, secure it in place with the thumbscrew on the diagonal, and you’re ready to observe. Note About the 2" Crayford Focuser The 100mm ED comes equipped with a Crayford focuser. The Crayford design allows for smooth, precise focusing without any image shift that typical rack-and-pinion designs experience. If you find that the focus wheels are too tight or too loose, you can make adjustments to the focuser tension by using the focuser tension thumbscrew located on the bottom of the optical tube, between the focus wheels. Make adjustments to this thumbscrew until the focuser motion feels comfortable. Please note that you must have at least some tension applied to the focuser drawtube or else it will not move when you turn the focus wheels. Calculating Magnification (Power) It is desirable to have a range of eyepieces of different focal lengths, to allow viewing over a range of magnifications. To calculate the magnification, or power, of a telescope, simply divide the focal length of the telescope by the focal length of the eyepiece: Telescope F.L. . Eyepiece F.L. = Magnification For example, the 100mm ED, which has a focal length of 900mm, used in combination with a 25mm eyepiece, yields a power of 36x. 900 . 25 = 36X Every telescope has a useful limit of power of about 45x-60x per inch of aperture. Claims of higher power by some telescope manufacturers are a misleading advertising gimmick and should be dismissed. Keep in mind that at higher powers, an image will always be dimmer and less sharp (this is a fundamental law of optics). The steadiness of the air (the “seeing”) will limit how much magnification an image can tolerate. Always start viewing with your lowest-power (longest focal length) eyepiece in the telescope. After you have located and looked at the...