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Distortion Correction for Hasselblad XCD 21mm f/4
Barrel distortion is about 3%, good for a lens covering a 44 X 33mm sensor at this ultrawide focal length, but not better than the Fujifilm GF 20mm f/4 at 21.5mm and considerably more than the Fujifilm GF 23mm f/4.
The straightforward barrel distortion is more appealing for general photography than the wave-type distortion of a lens like the Zeiss Milvus 21mm f/2.8. Still, horizons, buildings, etc are going to show the distortion.
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