The fallacy of 35mm "equivalent focal lengths"

Started 3 months ago | Discussions thread
OP Tony Beach Forum Pro • Posts: 11,934
Re: The fallacy of 35mm "equivalent focal lengths"

Donald B wrote:

nothing wrong with good quality small cameras

I didn't say there was. Indeed, part of what I wrote about is equivalence, and that's a two-edged sword -- so on the one hand you need ever smaller focal numbers (so using f/2 on a 50mm lens is the same as using f/1 on a 25mm lens) but on the other hand when you stop down a larger lens on a larger format you are essentially staying even with what can be done on a smaller lens on a smaller format (so using f/2 on a 25mm lens is equivalent to using f/4 on a 50mm lens).

Buried in all that text I did say I should be able to get more reach with the sub $400 camera that I am getting my girlfriend versus the thousands of dollars I have spent on my D800 and lenses. The fallacy I was writing about is that any lens, really on any format (even on 35mm) has an equivalent focal length that can be defined by anything other than its FOV on the format its being used on.

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