Corner sharpness: Four Thirds vs 35mm (bandwidth warning)

Started Oct 27, 2007 | Discussions thread
Amin Sabet
OP Amin Sabet Veteran Member • Posts: 6,763
Re: Effective f stops on 4/3rds

Charles Nguyen wrote:

With 4/3rd camera it's 2 stops slower than 35mm FF say at 50mm f1.4
you can have a Pan L1 25mm at f1.4 but in reality you're shooting at
f2.8. It's sort of fallacy when talking about fast 4/3rd lenses.

I disagree with your wording, though I agree with the spirit of what you are saying. The Four Thirds sensor is effectively two stops slower, so with a lens at the same f-stop, the Four Thirds system is effectively two stops slower. It's incorrect to say the Four Thirds lens is slower, since any f/1.4 lens will have the same effect on exposure, independent of format. It is thus entirely appropriate to speak of fast 4/3rd lenses.

Too
bad you don't have the exact focal lengths to compare between the 2
systems. I would like to see 28-70mm f2.8 L lens vs 14-54mm f2.8/3.5
Oly lens.

Well those are very different focal lengths. In terms of focal lengths that give the same field of view, I did just that. I shot a 28mm lens on the 35mm camera and a 14mm lens on the Four Thirds camera. Is it that you want to see a zoom versus a zoom?

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