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Focal length "stop" scale

No.3967721 View ViewReplyOriginalReport
So a millimeter of focal length has a huge impact on the image on the wide end, but not so much on the long end. Could we come up with a standard scale of "stops" of focal length, just like we have for aperture (e.g. 2.8, 4, 5.6, 8, 11..)?