Is my thinking about equivalence right?

Started 3 months ago | Questions thread
SrMi
SrMi Senior Member • Posts: 2,311
Re: Is my thinking about equivalence right?

Muster Mark wrote:

Just look at the lenstip data. The Sony 50mm 2.5 has vignetting of 2.29 stops in the corners. The olympus 25mm1.2 has at most 1.3 stops of vignetting. Th Sony GM 50 1.2 has almost 3 stops of vignetting wide open.
Normal equivalence would say FF at 1.2 is gathering 4x the light as m43 at 1.2. That's not true if it's falling off so much more. Is the difference big? No I don't think so. I don't think most people care so much about vignetting, but it makes the "total light" calculation rather different.

Vignetting can be corrected nicely in the post, but it increases noise in the corners.

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