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EXCERPT page containing first few paragraphs. 2017-04-28 06:55:57

Leica 135mm ƒ/3.4 APO-Telyt-M

MTF: 135mm f/3.4 APO-Telyt-M

Wide open, performance is high over most of the frame, but stopping down to ƒ/5.6 pops the contrast to a very high level over the central 3/4 of the frame, with a graceful drop to the edges and corners.

Since MTF ƒ/4 is not supplied, we cannot be sure if most of the gains of ƒ/5.6 are already present, but most likely there are some benefits to ƒ/5.6 over ƒ/4, not the least of which will be concern over focus error, which is almost a certainty with a 135mm lens and rangefinder focusing.

This is a very high performance, but less uniform and less good to the edges and corners as compared with the 90/2 Summicron-M ASPH. The astigmatism that is seen at ƒ/5.6 and particularly at ƒ/8 is apparently due at least in part to lateral chromatic aberration, as per field shots which reveal this color error on higher resolution mirrorless camera bodies.

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