Is my thinking about equivalence right?

Started 3 months ago | Questions thread
xpatUSA Forum Pro • Posts: 20,125
Re: Is my thinking about equivalence right?

Muster Mark wrote:

Hi all, I realize this is NOT the topic everyone loves to discuss and I totally understand. I hope no-one feels annoyed by this post. That said, after some investigation I have come to the conclusion that "traditional" equivalence math is only useful as a rough heuristic to get a sense of what DOF will be and NOT a reasonable way to compare individual lenses or judge cost/performance of lenses in different systems.<>

If there is anything I should be accounting for that I am not (and you know how I might, e.g. t stops) I'd be curious to hear.

You might find this to be of interest. It places an emphasis on actual aperture diameter rather than f-numbers.

As to equivalence, Falk Lumo is my Guru:

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Pedantry is hard work, but someone has to do it ...

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