EXCERPT page containing first few paragraphs. 2020-07-07 18:17:29
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MTF (calculated*, not measured) is shown below at 35mm, 55mm, 75mm.
In general, the Hasselblad XCD 35-75mm f/3.5-4.5 is optimal wide open, or nearly so. Stopping down tp f/8 serves to improve the edge to corner area while dropping MTF of coarse and medium and fine structures from diffraction.
In general the Hasselblad XCD 35-75mm f/3.5-4.5 delivers exceptionally consistent performance across the entire zoom range.
Toggle each graph to compare wide open to f/8.
Calculated MTF curves including diffraction. Not measured from real lenses. sagittal slit orientation drawn with continuous line and tangential with dashed. White light. Spatial frequencies 10, 20 and 40 lp/mm.
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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