User manual CELESTRON C130MM

[. . . ] For example, the C130 Mak finder is 10x50 which means it is 10 power and has a 50mm objective lens. So, a 10 power finder magnifies images ten times more than the human eye. The finderscope is adjusted using the six adjustment screws located 120° around each finderscope ring. The finderscope comes pre-assembled and is mounted inside the finderscope bracket rings. [. . . ] Once an image is in focus, turn the knob clockwise to focus on a closer object and counterclockwise for a more distant object. A single turn of the focusing knob moves the primary mirror only slightly. Therefore, it will take many turns to go from close focus (approximately 40 feet) to infinity. For astronomical viewing, outof-focus star images are very diffuse making them difficult, if not impossible, to see. If you turn the focus knob too quickly, you can go right through focus without seeing the image. For best results, your first astronomical target should be a bright object (like the Moon) so that the image is visible even when out of focus. Calculating Magnification To determine the magnification of your spotting scope, simply divide the focal length of the spotting scope by the focal length of the eyepiece used. In equation format, the formula looks like this: Magnification = Focal Length of Spotting Scope (mm) Focal Length of Eyepiece (mm) Let's say, for example, you are using the 32mm Plossl eyepiece. To determine the magnification you simply divide the focal length of your spotting scope (2000mm) by the focal length of the eyepiece, 32mm. Although the power is variable, each instrument under average skies has a limit to the highest useful magnification. The general rule is that 60 power can be used for every inch of aperture. Multiplying 5 by 60 gives a maximum useful magnification of 300 power. Although this is the maximum useful magnification, most observing is done in the range of 20 to 35 power for every inch of aperture which is 100 to 175 times for the C130 spotting scope. Attaching a Camera With the use of an optional photograghic T-adapter (#93635-A) and camera specific Tring, a 35mm camera can be attached to the rear cell of the spotting scope. Remove the erect image diagonal and eyepiece from the rear cell of the tube. Mount your camera body onto the T-Ring the same as you would any other lens. Thread the T-Adapter onto the back of the C130 by rotating the slip ring clockwise while holding the camera in the desired orientation (either vertical or horizontal). Figure 1-4 ­ Optional T-adapter and T-ring attachment onto the rear cell. Technical Specifications Model Optical Design Aperture (mm) Focal Length (mm) Eyepiece Angular Field of View (FOV°) Linear FOV (ft. @ 1000 yds) Eye Relief Near Focus Coating Length Weight 52275 Maksutov-Cassegrain 130 2000 32mm (63x) . 83° 44ft 22mm 40ft Multi-Coated 18 in 9. 25 lbs All specifications given with standard eyepiece and are subject to change without notice. CELESTRON LIMITED LIFETIME WARRANTY A. Celestron warrants this spotting scope to be free from defects in materials and workmanship for its usable lifetime. Celestron will repair or replace such product or part thereof which, upon inspection by Celestron, is found to be defective in materials or workmanship. As a condition to the obligation of Celestron to repair or replace such product, the product must be returned to Celestron together with proof-of-purchase satisfactory to Celestron. The Proper Return Authorization Number must be obtained from Celestron in advance of return. [. . . ] ANY WARRANTIES WHICH ARE IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF ONE YEAR 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. Celestron reserves the right to modify or discontinue, without prior notice to you, any model or style spotting scope. [. . . ]