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Distortion for Zeiss Otus 28/1.4
Distortion is almost invariant from 1:30 to infinity, a boon if one wishes to correct for it.
At infinity, barrel distortion extends to frame edge, flattening to the corners. Maximum distortion is about 1.3%, versus about 2.1% for the ZF.2 28mm f/2 Distagon.
At 1:30, distortion is just a tiny bit more in the corners, and with only a minor deviation in the shape of the distortion curve.
For additional context, the Leica 28/1.4 Summilux-M ASPH has a very low 0.6% distortion, but its distortion is a wave type (barrel reversing to pincushion), which is less natural to the eye. The Leica 28mm f/2 Summicron-M ASPH distortion is very similar to the Otus 28/1.4. The Leica 28mm f/2.8 Elmarit-M ASPH has the lowest distortion of all, at about 0.4%.
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NIKON D810 + Zeiss Otus 28mm f/1.4 APO-Distagon
RAW: vignetting corrected, push 0.33 stops, +15 Clarity
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