Why does nikon....

Started May 28, 2013 | Discussions thread
cplunk
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Re: Why does nikon....
In reply to davidib17, May 29, 2013

http://www.dpreview.com/glossary/optical/focal-length

>The focal length of a lens is defined as the distance in mm from the optical center of the lens to the focal point, which is located on the sensor or film if the subject (at infinity) is "in focus".

This has nothing to do with the format the lens is intended to be used on.

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