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Leica 75mm f/1.25 Noctilux-M ASPH

MTF

Unlike its 50mm f/0.95 sibling, the Leica 75mm f/1.25 Noctilux-M ASPH shows far superior control of field curvature wide open and at every aperture. Indeed, its MTF at f/5.6 is flatlined at levels similar to the Zeiss Otus 85mm f/1.4 APO-Planar*.

* Although the Otus 85 reaches higher levels, the Otus 85 has more astigmatism. On the other hand, the Otus 85 is measured (real world) MTF. How well an actual sample of the Noctilux 75/1.25 actually performs might well differ from Leica’s computed theoretical MTF, which also also does not take into account sensor cover glass on a real camera nor flare under real-world shooting conditions.

Performance at f/1.25 is very high and with a quite flat field, considering that it is both f/1.25 on full frame and that this has half the depth of field of a 50mm f/0.95. Bear in mind that pinpoint focus is mandatory with a tiny focusing error greatly reducing this performance. Only maximum magnification Live View will suffice for getting the eyes sharp in a portrait, or for just about anything else (if one is shooting at f/1.25).

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Aperture series 1.25,2,5.6 available in full article
MTF for Leica 75mm f/1.25 Noctilux-M ASPH

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