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INSTRUCTION MANUAL
®
Orion
Schmidt-Cassegrain
Telescopes 8", 9.25", & 11"
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 265 Rev. A 8/05
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Congratulations on your purchase of an Orion Schmidt-Cassegrain telescope! The Schmidt-Cassegrain opti- cal system uses a combination of mirrors and lenses and is referred to as a compound or catadioptric telescope. This unique design offers large-diameter optics while maintaining very short tube lengths, making them extremely portable and versatile. The Schmidt-Cassegrain system consists of a zero-power corrector plate, a spherical primary mirror, and a secondary mirror. Once light rays ent
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Inserting an Eyepiece Aligning the Finder Scope An eyepiece magnifies the image focused by the telescope. Accurate alignment of the finder scope makes it easy to The eyepiece fits into either the visual back directly or the star find objects with the telescope, especially celestial objects. diagonal. To install an eyepiece: To make aligning the finder as easy as possible, this proce- dure should be done in the daytime when it is easy to find 1. Loosen the set screw on the star diagonal until
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1 Choose a target that is in excess of one mile away. This is sharp. Once an image is in focus, turn the knob clockwise eliminates any possible parallax effect between the tele- to focus on a closer object and counterclockwise for a more scope and finder. distant object. A single turn of the focusing knob moves the primary mirror only slightly. Therefore, it will take many turns 2 Release the altitude and azimuth clamps of your telescope (about 30) to go from close focus to infinity. mount
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This level of magnification assumes you have ideal conditions You can use a commercially made lens cleaner or mix your for viewing, however. The clearest, sharpest views will always own. A good cleaning solution is isopropyl alcohol mixed with be achieved at lower powers. distilled water. The solution should be 60% isopropyl alcohol and 40% distilled water. Or, liquid dish soap diluted with water Keep in mind that as you increase magnification, the bright- (a couple of drops per one quart of
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Figure 7. Even though the star pattern appears the same on both sides of focus, it is asymmetric. The dark obstruction is skewed off to the left side of the diffraction pattern indicating poor collimation. Or, if you do not want to power up your telescope, you can use Figure 8. In a well-collimated Polaris. Its position relative to the celestial pole moves very telescope, a defocused star image should appear symmetrical, with the little, thus eliminating the need to manually track it. dark
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Orion Two-Year Limited Warranty Orion warrants this telescope to be free from defects in materials and workmanship for two years. Orion will repair or replace such product or part thereof which, upon inspection by Orion, is found to be defec- tive in materials or workmanship. As a condition to the obligation of Orion to repair or replace such prod- uct, the product must be returned to Orion together with proof-of-purchase satisfactory to Orion. The Proper Return Authorization Number must be obt
