APS-C lenses -- do you use full-frame or APS-C mm-designations?

Started Mar 10, 2013 | Discussions thread
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MisterBG Veteran Member • Posts: 5,885
Re: APS-C lenses -- do you use full-frame or APS-C mm-designations?

The focal length of a lens is it's focal length, a physical/optical parameter that does not change.

It does not change because it is mounted on a different camera.

It is therefore sensible to refer to the true optical focal length, and to qualify this if it is apparently modified by cropping etc.

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