New Sigma 17-50 f2.8 OS lens, any interest?

Started Jul 15, 2010 | Discussions thread
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chrswggl Senior Member • Posts: 1,850
Re: Photozone Lens Test FAQ

Just curious, why is this the only thing you post on these forums?

Bare wrote:

http://www.photozone.de/canon-eos/531-sigma1750f28os

This Sigma is in field better than both Tamrons 17-50 because of much less filed curvature.

Where do they measure the center, borders and extreme borders?
Here's an overview:

red - center
green - borders
blue - extreme
As you see at F2,8 extremes are completely irrelevant.

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