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Focal Length for 4/3 and Micro 4/3

The Four Thirds and Micro Four Thirds formats differ in the flange to lens distance, but otherwise are identical. The discussion that follows is thus applicable to both.

What is the “equivalent” focal length as compared to a full-frame 35mm DSLR?

This question has more than one answer, depending on how one defines it, since the aspect ratios differ; 4:3 versus 3:2.

The usual answer is to use the diagonal of the frame, and this is exactly a 2:1 “field of view multiplier”. But the horizontal field of view (FOV) multiplier is actually 2.08. The difference is small enough that it’s fair to ignore it, and say that:

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