The fallacy of 35mm "equivalent focal lengths"

Started 3 months ago | Discussions thread
Gerry Winterbourne Forum Pro • Posts: 15,628
Re: So two lenses of same focal length on same camera aren't equivalent
4

Tony Beach wrote:

What I'm actually saying is that there is no such thing as equivalent focal length. It should instead be referred to equivalent AOV.

Wrong. The AOV isn't equivalent, it's equal.

The difference is very simple - equal means being the same while equivalent means having the same effect ...

The very fact that effective equivalence can be changed by changing cameras or lenses even when using the same format demonstrates the fallacy of the term.

… which therefore demonstrates not the fallacy of the term but its correctness.

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Gerry
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First camera 1953, first Pentax 1985, first DSLR 2006
http://www.pbase.com/gerrywinterbourne
gerry.winterbourne@ntlworld.com

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