The fallacy of 35mm "equivalent focal lengths"

Started 3 months ago | Discussions thread
tony field Forum Pro • Posts: 10,119
Re: A fourth

I prefer using "standard definitions" as provided by Joe's Equivalence or DPR's "focal-length multiplier". At least these are a common reference. If someone has a deviation from the common reference, for conversation it should be carefully defined as you did. For example I could state that silver lenses are not equivalent to black lenses and leave it up to the reader to figure out what I mean.

Personally I have no use for equivalence other than approximate comparison of different cameras systems, realizing that all of the technically defined parameters of equivalence are accurate and demonstrable. These tenants are easily proved even using a single camera to perform all of the tests.

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Charles Darwin: "ignorance more frequently begets confidence than does knowledge."
tony
http://www.tphoto.ca

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