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

Started 4 months ago | Discussions thread
Sergey_Green
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Bob says ..
In reply to knickerhawk, 4 months ago

knickerhawk wrote:

bobn2 wrote:

..

If we throw out the higher resolution sensors and adjust for the many more tested combinations, the number is much smaller than 368, but the problem doesn't end there. The dxo lens score isn't equivalence based. For instance, the highest score for the Nikkor 24-70mm f/2.8 on a 16mp Nikon body is 25 and the highest score for the Oly 12-40mm f/2.8 on a 16mp m43 body is 20. Looks like the Oly lens is inferior to the Nikkor by a significant margin, doesn't it? But look what happens when we set the respective dxo score maps at equivalent aperture settings:

That tells a rather different story than the basic score, doesn't it?

Try 24-105/4 Sigma, where f/5.6 on the Olympus lines up with f/11 on the Sigma. Sigma looks better.

And while I seldom look at this stuff, I am tempted to add one single question here; does it mean Sigma is a better lens than 24-70/2.8? Hmm.

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- sergey

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