Meade Polaris 127mm User Manual - Page 20

objects 100 times. 18 You can calculate how much magnification an eyepiece will have with your specific telescope. Just divide the telescope focal length by the focal length of the eyepiece. Focal Length of the Telescope ÷ Focal Length of the Eyepiece = Magnification can triple or further increase the power of an eyepiece. To find out how much your magnification is when you use a 2x Barlow, multiply your eyepiece's magnification by two. For example, the 25mm low-power eyepiece used with the Polaris 90 magnifies an object 36 times. Multiply 36 by 2 and you get 72 times magnification with a Barlow. Eyepiece's magnification x 2 = Magnification with a 2X Barlow lens Look at the specifications. For example, you will see that the focal length of the Polaris 90 is 900mm. Let's say that you have obtained a 6.3mm eyepiece. You can tell what the focal length of your eyepiece is as it is always printed on the side of the eyepiece. Divide: 900mm ÷ 6.3mm, which equals 142.86. Round this off to the nearest whole number and you find the 6.3mm eyepiece used with It's worth repeating: Keep in mind that a bright, clear, but smaller image is more interesting than a larger, dimmer, fuzzy one. Using too high a power eyepiece is one of the most common mistakes made by new astronomers. So don't think that higher magnification is necessarily better-quite often the best view is with lower magnification value! the Polaris 90 magnifies objects 143 times. If you use a Barlow lens with one of your eyepieces, it doubles the magnification of your eyepiece. Other types of Barlows TAKING CARE OF YOUR TELESCOPE Your telescope is a precision optical instrument designed for a lifetime of rewarding viewing. Looking at or near the Sun will cause irreversable damage to your eye. Do not point this telescope at or near the Sun. Do not look through the telescope as it is moving. It will rarely, if ever, require factory servicing or maintenance. Follow these guidelines to keep your telescope in the best condition: •As with any quality instrument, lens or mirror surfaces should be cleaned as infrequently as possible. Front surface aluminized mirrors (reflecting models), in particular, should be cleaned only when absolutely necessary. In all cases avoid touching any mirror surface. A little dust on the surface of a mirror or lens causes negligible loss of performance and should not be considered reason to clean the surface. When lens or mirror cleaning does become necessary, use a camel's hair brush or compressed air gently to remove dust. If the telescope's dust cover is replaced after each observing session, cleaning of the optics will rarely be required. •Fingerprints and organic materials on the lens or mirror may be removed with a solution of 3 parts distilled water to 1 part isopropyl alcohol. You may also add 1 drop of biodegradable dishwashing soap per pint of solution. Use soft, white facial tissues and make short, gentle strokes. Change tissues often. CAUTION: Do not use scented or lotioned