User manual CELESTRON ONYX80EDF

[. . . ] The turbulent air caused by these conditions makes it impossible to get a truly sharp focus. Avoid hazy skies, fog, and mist, all of which can make it difficult to focus, thus greatly reducing the amount of detail seen. Remember that no matter how good the optics of your instrument are, they can NOT perform to their fullest under adverse conditions. 2. 3. 4. Calculating Magnification (Power) You can change the magnification of your scope simply by changing the eyepiece (also called an ocular). To determine the magnification with your telescope, simply divide the focal length of your telescope by the focal length of the eyepiece. [. . . ] Once you start observing deep sky objects, there are a few things to remember. Second, visually they are too faint to reveal any color that is common to photographs. And lastly, because of their low surface brightness, they should be observed from a dark sky location. Light pollution around large urban areas washes out most nebulae making them difficult, if not impossible, to see. An LPR (Light Pollution Reduction) Filter (#94126A) is available for use with 1 1/4" eyepieces to allow urban use of the 80EDF for looking at nebulae. Photographing the Moon After looking at the night sky for awhile you may want to try photographing it. Attach your telescope to a stable platform like the Celestron Alt-Az Tripod (#93607). Load your camera with film that has a moderate-to-fast speed (i. e. , high ISO rating). When the Moon is full, and at its brightest, slower films are more desirable. If photographing during the full phase, use a yellow filter to reduce the light intensity and to increase contrast. Trip the shutter using a cable release so as not to shake the camera and telescope. Lunar Phase Crescent Quarter Full ISO 50 1/8 1/30 1/125 ISO 100 1/15 1/125 1/500 ISO 200 1/60 1/250 1/1000 ISO 400 1/125 1/500 1/2000 3. 5. The exposure times listed here should be used as a starting point. Always make exposures that are longer and shorter than the recommended time. Also, try bracketing your exposures, taking a few photos at each shutter speed. This information will be useful if you want to repeat your results or if you want to submit some of your photos to various magazines for possible publication! CARE AND CLEANING OF THE OPTICS Occasionally, dust and/or moisture may build up on the lens of your telescope. Special care should be taken when cleaning any optical instrument so as not to damage the optics. If dust has built up on the lens, remove the dust with a camel's hair brush or a can of pressurized air. Then use an optical cleaning solution (available at most optical suppliers) and white tissue paper to remove any remaining debris. A good cleaning solution is isopropyl alcohol mixed with distilled water. Or liquid dish soap diluted with water (a couple of drops per one quart of water) can be used. Internal adjustments and cleaning should be done only by the Celestron repair department. If your telescope is in need of internal cleaning, please contact the factory for service. [. . . ] CELESTRON EXPRESSLY DISCLAIMS ANY LOST PROFITS, GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM BREACH OF ANY WARRANTY, OR ARISING OUT OF THE USE OR INABILITY TO USE ANY CELESTRON PRODUCT. ANY WARRANTIES WHICH ARE IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF TWO YEARS FROM THE DATE OF ORIGINAL RETAIL PURCHASE. Some states do not allow the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty lasts, so the above limitations and exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. [. . . ]