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Optics Question

  1. Aug 12, 2009 #1
    Hi I'm legally blind, so I own a small telescope that I use to see the board at school and stuff. On the front of it are these specifications:

    6x16 0,25m-infinity

    175/1000m 10degrees

    What do they mean?

    Thanks for your time.
     
  2. jcsd
  3. Aug 12, 2009 #2

    mgb_phys

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    The first number is the magnification, things appear 6x bigger
    The second number is the diameter of the lens (in mm) bigger collects more light.
    16mm is quite small (2/3") but should be good enough in daylight.

    The focus range from 0.25metres to infinity

    The field of view, 10 degrees or if you prefer a 175metre wide field at 1000m metre distance.
    this is related to the magnification a bigger magnification is a smaller field of view - so more detail but you can see less without moving your head.
     
    Last edited: Aug 12, 2009
  4. Aug 12, 2009 #3
    Thanks for the great response! All makes perfect sense.
     
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