EXCERPT page containing first few paragraphs. 2021-06-24 13:58:39
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This page assesses shows how the focus shift of the Hasselblad XCD 90mm f/3.2 is relevant, particularly for a curved surface such as an eye—by using a curved surface to show that f/8 can be worse than f/3.2 due to the focus shift.
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Whether or not the focus shift will wreck the final image depends entirely on the initial focus. If the lens front-focuses slightly as it often might, then stopping down will shift focus just about the right amount for a crisp image! If the focus starts out as shown, the leading edge loses focus—even at f/8 as seen here.
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