Reviews and Problems with Nikon AF Nikkor 20mm f/2.8D
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Not bad but not good enough for D800
Bob, B&H Photo
9 July 2012
Excerpt: Probably not too bad a lens on lower resolution sensors but its age shows at D800 resolutions. Soft a bit off axis at 5.6, a little better at 8, but edge and corners are pretty soft compared to the Zeiss wides. If you like the look fine but otherwise it just has too much fall-off and CA for my taste.
Summary: Unlike what previous reviewer has said, this lens can not be corrected electronically for barrel distortion on an FX body as the distortion is complex in signature. DO NOT buy this for photographing groups people. neither DXO nor photoshop (CS5) softwares can correct the barrel distortion for this lens.