what is it? help please

Discussion in 'Photographic Discussions' started by djhickory, Jun 28, 2010.

  1. djhickory

    djhickory TPF Noob!

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    i got this from my grandpa as a gift years ago, he told me that it was used to take pics on a spy plane really high, was wondering if there is a name for this type of lens so i can look more up on it, and see if it has any value?
    thanks very much

    pics_ - MyPicx.com
     
  2. Dwig

    Dwig TPF Noob!

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    Its some form of catadioptric lens (aka "mirror lens")

    Catadioptric system - Wikipedia, the free encyclopedia

    It was probably a low production custom lens, possibly a one-off. Without some sort if ID plate or marking it would be a rather difficult task to track down the fabricator.
     
  3. KmH

    KmH Helping photographers learn to fish Supporting Member

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    I concur. Catadioptric optics have a folded light path so the actual length of the lens is only about 1/2 the total focal length of the optical system.
    a camera was placed in front of the small glass at the back of the lens, in the left hand photo.

    The secondary mirror is quite a ways in front of the corrector plate (right hand photo).

    An 800mm Bower mirror lens:

    Bower 800mm f/8 Manual Focus Telephoto T-Mount Lens

    They make telescopes too, using that optical system;

    http://www.shopatron.com/products/category/1323.0.28926.44280.0.0.0
     

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