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EXCERPT page containing first few paragraphs. 2021-10-25 13:36:37

Leica 50mm f/2 APO-Summicron-SL ASPH

MTF for Leica 50mm f/2 APO-Summicron-SL ASPH

MTF can be measured from a real lens, or computed from a lens design. Leica uses computed MTF which therefore means the graphs are fantasy graphs assuming perfect (impossible) actual lenses. Long experience with a lot of Leica M glass shows that real lenses rarely if ever are fully symmetric across the field, nor do they perform as well as computed charts suggest.

Speaking purely to what the MTF charts claim (computed MTF, not measured, no accounting for distortion correction), central sharpness wide open at f/2 shows world class micro contrast across the frame. While it declines into the corners, the sharpness even in the far corners is a good as many lenses get at their best aperture.

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MTF for Leica 35mm f/2 APO-Summicron-SL ASPH

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