Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2

Started 6 months ago | Discussions thread
Just another Canon shooter
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Re: Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2
In reply to Anders W, 6 months ago

Anders W wrote:

As to diffraction, the larger format has an advantage when comparing at the same (rather than equivalent) f-stops. At equivalent f-stops, there is no difference at all, and the impact of diffraction is generally trifling at wide apertures.

At equivalent stops, the smaller format lens can NOT be a scaled down version version of the larger one.

Of course it can. For example, the MFT 25/1.8 at f/1.8 would be equivalent to the FF 50/1.8 from which it was scaled down at f/3.6.

But 25/1.8 is NOT a down scaled version of the 50/3.6! Your scaling argument falls apart at equivalent settings. You need to scale the whole world, wavelength and light density included for that.

The lowly Canon 50/1.4 at f/4 beats the Panasonic 25/1.4 at f/2 by a comfortable margin (PZ) both in the center and at the borders, and I am not even mentioning the new Sigma 50 here which might very well be sharper wide open than anything you own at any aperture.

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