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Why is a telephoto lens considered to have a longer focal length than that of single?

  1. Sep 17, 2010 #1
    Why is a telephoto lens considered to have a longer focal length than that of single convex lens?
     
  2. jcsd
  3. Sep 17, 2010 #2

    DaveC426913

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    Gold Member

    Re: Why is a telephoto lens considered to have a longer focal length than that of sin

    The first few sentences http://en.wikipedia.org/wiki/Telephoto_lens" [Broken] seem to cover that off nicely.
     
    Last edited by a moderator: May 4, 2017
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