FX & DX lenses & sensors - field of view explained

Friday, 13 April 2012 02:34

 What happens to field of view? When is a 50mm a true 50mm?

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  • Comment Link PRKingCraig, Craig Robinson Saturday, 21 April 2012 08:55 posted by PRKingCraig, Craig Robinson

    Matt, Question on the focal length of a lens.
    How do manufactures measure the focal length of a lens.
    my uneducated thought would be the following.
    50mm lens
    Using a full frame sensor size cutout i.e. an old picture slide, holding the slide up 50mm away from your eye is this what a 50mm lens would be measured to replicate ???
    If not how is the measurement of a 50mm lens done.

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