20mm f/2.8 options

Started Jul 16, 2014 | Discussions thread
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Joseph Tainter Veteran Member • Posts: 9,323
Re: 20mm f/2.8 options

Nigli wrote:

Has anyone used the FA 20 and the 21 ltd: if yes, how do they compare at maximum aperture?

I did a brick wall test of the two, and could not see any difference between them.

That was years ago, though, with the *ist D. At the same time, I could see (with the same test procedure) that the FA20 F2.8 at F2.8 (wide open) was noticeably sharper than the Sigma 20 F1.8 stopped down to F2.8.

Joe

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