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MTF for Hasselblad XCD 28mm f/4 P
MTF (calculated*, not measured) is shown below at f/4 and f/8. Real lenses often fall short of calculated figures.
Performance is strong wide open at f/4, but with indications of a moderately strong field curvature.
Astigmatism is also very significant and this could lead to some less than ideal bokeh and possibly color fringing.
Stopping-down to f/8 still shows a waviness far from even/flat, a wave-type field curvature. To be that prominent at f/8 means it will not be easy to get sharp images at distance across the field—problematic for landscapes and similar, and no fun at all for focus stacking, leaving you guessing where sharpness will land, a huge headache for retouching.
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