Equivalent focal length for MFT lenses

Started Apr 12, 2013 | Discussions thread
David Kieltyka
David Kieltyka Veteran Member • Posts: 5,245
Angle-of-view & Sensor size

JeanPierre Martel wrote:

What makes a difference is when a lens made for a full frame camera is used on a m4/3 camera (with an adapter). The angle of view doesn't change.

No, the angle-of-view most certainly *does* change. This is due to the 35mm and M43 formats being different in size. A lens has no particular built-in angle-of-view. The thing that *doesn't* change is the size of the image circle projected by the lens. The smaller M43 sensor sees less of the image circle projected by the lens, and thus gives you a narrower angle-of-view than the same lens does when mounted on a 35mm camera.

My Nikon 28mm shift lens projects a huge image circle compared to my standard Nikon 28mm. But both lenses produce the same angle-of-view when mounted on the same camera.


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