EXCERPT page containing first few paragraphs. 2020-07-07 21:35:35
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The Hasselblad HC 120mm f/4 II covers the huge 54.3 X 40.0 mm sensor of the Hasselblad H6D-100C. That sensor size has a diagonal of 67.4mm, which means an image distance of 33.7mm from center, well within what the MTF chart shows (out to about 35mm).
MTF at infinity focus
Wide open performance shows moderately high contrast for coarse and medium structures improves to world-class levels at f/8.
Micro contrast wide open at f/4 is good at center and moderate out to the corners. Stopping down to f/8 is highly worthwhile, with a major boost in micro contrast. Given the very large coverage of 67mm (vs 43mm for the 35mm format), this performance is very strong.
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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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