EXCERPT page containing first few paragraphs. 2019-03-24 21:39:09
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This page assesses focus shift of the Hasselblad XCD 90mm f/3.2 using a high contrast test target (the Lens Align target that one would typically use for “fine focus adjust”).
Focus shift on high contrast target
Shooting distance here was 90 cm from subject to film plane—portrait distance. Thus it is directly relevant to any portrait photographer. Sharp eyes are critical for portraits, specifically the sharp iris of the eye (check out these eyes). Focusing on eyes is something that requires millimeter precision, so a focus shift of even a few millimeters becomes a disaster.
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