Is my thinking about equivalence right?

Started 3 months ago | Questions thread
OP Muster Mark Contributing Member • Posts: 588
Re: Is my thinking about equivalence right?

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.

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 Muster Mark's gear list:Muster Mark's gear list
Olympus E-3 Olympus Zuiko Digital ED 50mm 1:2.0 Macro Olympus Zuiko Digital ED 12-60mm 1:2.8-4.0 SWD Olympus Zuiko Digital ED 50-200mm 1:2.8-3.5 SWD
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