All examples are on the full-frame Nikon D3x. Most images can be clicked to see a larger version and/or actual-pixels crops.
See also the Aberrations page.
Wide open, resolution and contrast are acceptable, but looking quite smeared away from center. While stopping down to f/5.6 improves matters, the edges and corners remain smeared looking.
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Nikon D3x + Voigtlander Color Skopar 20/3.5 @ f/3.5