Is my thinking about equivalence right?

Started 5 months ago | Questions thread
Bassam Guy Veteran Member • Posts: 3,132

jwilliams wrote:

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.

No, not really. Equivalence is more than DOF or even mainly about DOF. I'll not go into any long winded discussion, but here's an article on this site that is a good read on the subject.

Equivalence is useful if you have any interest in light (and as a photographer, you probably should): Digital Photography Review (

That is not true. 'Equivalence' implies at least two things. If 43 is your only sensor size then equivalence is meaningless.

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