FOV Oly 17/1.8 vs. ACTUAL FOV Pany 20/1.7?

Started Nov 15, 2012 | Questions thread
W A Stewart Senior Member • Posts: 1,025
Different aspect ratios...

require assumptions about how you will (or will not) crop to calculate equivalence.  The two-times rule of thumb is based on the diagonal.  If you leave your prints at 4:3 (e.g. 12 by 9) or even go closer to the square at 8X10 you get relatively more field of view in the shorter dimension (that is, the height when shooting in landscape orientation).  In general, the field of view is a bit greater for all four thirds lenses assuming normal printing.  Moreover, most 3:2 shooters will cut off some of the field of view at the widths because not many print at 3:2 (especially for magazines and books).  I think Leica inflicted on the small camera world because at the time the image was seen as really small, the 24mm was a given, and all they could control with the 36mm (which, incidentally, Nikon resisted in its first two models).

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W Alex Stewart

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