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Old 11th June 2013
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Ians Tata Ians Tata is offline
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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?

Jeff
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Old 11th June 2013
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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.

Ian
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