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Thread: Simple Question

  1. #1
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    Simple Question

    Just a simple question, that I should probably already know the answer to anyway.
    When looking at a "legacy" lens, would, for instance, a 50mm lens be a 50mm or would the 4/3 "crop factor" make it a 100mm lens? And what would the "F" be?

    And a question that I wouldn't know, if using a "reverse" mount, for macro, what would those factors be?

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  2. #2
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    Re: Simple Question

    Yes, the crop factor means the field of view will be half that of a full frame lens of the same focal length (when fitted to a full frame camera). Put a FF 50mm lens on a Four Thirds or Micro Four Thirds camera and its field of view will be the same as a Four Thirds 50mm lens.

    A Four Thirds 50mm lens (or legacy FF 50mm lens) will, conversely, have the same field of view as a FF lens on a FF camera with twice the focal length (100mm in this case).

    The aperture will have a split personality; brightness is exactly the same for a given aperture value regardless of focal length or cropping factor, but depth of field will be greater the smaller the frame size is.

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