User manual CELESTRON STARHOPPER TELESCOPE

[. . . ] StarHopper Telescope INSTRUCTION MANUAL TABLE OF CONTENTS INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 UNPACKING THE TELESCOPE / BASE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ASSEMBLING THE BASE FOR THE STARHOPPER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] If you're focusing on a star, its image should, as closely as possible, resemble a pinpoint. If you're focusing on the moon or a planet, rotate the focuser barrel until the image is sharp. Calculating Magnification You can change the viewing power of your Celestron Star Hopper telescope just by changing the eyepiece. There are various optional eyepieces shown in the Optional Accessories section of this manual. To determine the magnification of your telescope, simply divide the focal length of the telescope by the focal length of the eyepiece being used. In equation format, the formula looks like this: Focal Length of Telescope (mm) Magnification = ­­­­­­ Focal Length of Eyepiece (mm) To determine the magnification using the standard 25mm eyepiece, simply divide the focal length of your ® Star Hopper telescope by the focal length of the eyepiece (25mm). For example, dividing the focal ® length of the Star Hopper 8" (1200mm) by 25mm yields a magnification of 48 power. Although the power is variable, each telescope, used under average skies, has a limit to its highest useful magnification. The general rule is that 60 power is the maximum that can be used for every inch of ® aperture, although seeing condition rarely allow this. Multiplying 10 by 60 gives a maximum useful magnification of 600 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 200 to 350 for the Star Hopper 10. ® Determining Field of View Determining the field of view is important if you want to get an idea of the angular size of the object that you are observing. To calculate the actual field of view, divide the apparent field of the eyepiece (supplied by the eyepiece manufacturer) by the magnification. In equation format, the formula looks like this: Apparent Field of Eyepiece True Field = Magnification As you can see, before determining the field of view, you must calculate the magnification. Using the example above, we can determine the field of view using the same 25mm eyepiece. Divide the 52° by the magnification, which is 48 power for the Star ® Hopper 8. The apparent field of each eyepiece that Celestron manufactures is found in the Celestron Accessory Catalog (#93685). 16 CELESTIAL OBSERVING Now that your telescope is set up, you're ready to use it for observing. This section covers visual observing for both solar system and deep-sky objects. Observing the Moon In the night sky, the moon is a prime target for your first look because it is extremely bright and easy to find. Although the beauty of the full moon may make it seem a perfect viewing object, in fact, the light reflected from its fully illuminated face can be overpowering. One of the best times to observe the moon is during its partial phases, such as a crescent or quarter moon. At these times, long shadows reveal a great amount of detail on the lunar surface. At low power, with the standard eyepiece, you'll be able to see the whole lunar disk at one time. Change to higher power (magnification) with an optional eyepiece to focus in on a smaller area. Keep in mind that the rotation of the earth will cause the moon to drift out of your field of view. [. . . ] 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. Call Celestron at (310) 328-9560 to receive the number to be displayed on the outside of your shipping container. All returns must be accompanied by a written statement setting forth the name, address, and daytime telephone number of the owner, together with a brief description of any claimed defects. [. . . ]