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Magnitude in telescopes

  1. Aug 19, 2015 #1
    what is the difference between linear magnitude and angular magnitude
     
  2. jcsd
  3. Aug 19, 2015 #2

    davenn

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    never heard of either in reference to telescopes
    and I have used scopes for best part of 50 years

    please give more information
     
  4. Aug 19, 2015 #3
    my question is this:
     

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  5. Aug 19, 2015 #4

    russ_watters

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    Wait, do you mean magnification, not magnitude?
     
  6. Aug 19, 2015 #5
    Sorry i meant magnification.
     
  7. Aug 19, 2015 #6

    russ_watters

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    Angular magnification is what our eyes or a lens see, whereas linear magnification is what is projected onto a surface, so it is measured linearly.

    See (second section):
    http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/lensdet.html

    Since this is a telescope question, I'm moving the thread to that section.
     
  8. Aug 20, 2015 #7
    the other question i have got is: where do these formulas like field of view and .... come from
     
  9. Aug 20, 2015 #8

    davenn

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    I assume you mean, how is it calculated ?

    cheers
    Dave
     
  10. Aug 20, 2015 #9
    What is the prove of that FOV?
     
  11. Aug 21, 2015 #10

    russ_watters

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    It's derived from basic trigonometry. The angles and objects form triangles.
     
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