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  5. Instruction Manual

National Geographic NG 91 Instruction Manual

Summary of NG 91

  • Page 1

    Please retain the information in this manual for future reference. Colour, designs and decorations may vary from those shown in the photographs. Item no. Ng 91 printed in china instruction manual instruction manual 50mm astronomical telescope 50mm astronomical telescope ages 8 and up warning! Do not...

  • Page 2

    1 2 parts of your telescope lens hood lens cap (not shown) focus wheel erecting eyepiece tripod 8.3mm eyepiece diagonal mirror 16.6mm eyepiece focus tube telescope tube introduction with proper care and handling, you will enjoy looking at nature’s sights for many years. This telescope has been desig...

  • Page 3

    3 4 about magnification the magnification of a telescope indicates how much an image is enlarged or how big and close it appears to the viewer. The focal length of the eyepiece combined with the focal length of the telescope determine the magnification. To calculate the magnification of your telesco...

  • Page 4

    5 6 using your telescope 1. The best way to use your telescope is outside, because viewing through windows (even if they are open) can be distorted by reflections from the glass or by air currents (differing temperatures) passing through a window. 2. Let your telescope adjust to the outside temperat...