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EXCERPT page containing first few paragraphs. 2017-04-28 06:57:51

Leica 50mm ƒ/2 APO-Summicron-M ASPH

MTF: 50mm f/2 APO-Summicron-M ASPH

You will not find a better one for a 50mm lens; even at ƒ/2 the lens outperforms most 50mm lenses at ƒ/5.6.

By ƒ/5.6, the 50/2 APO is very close to what is theoretically possible, and is far sharper in the extreme corners than many lenses in the center!

It is appropriate that the MTF charts below place the 50/2 APO-Summicron-M ASPH at the top, with its siblings shown for comparison below.


Regrettably, Leica provides MTF charts for three apertures per lens, and those apertures vary depending on maximum lens aperture. Still, we have ƒ/2.8 for most lenses here, and ƒ/5.6 for all.

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Variants 0.95, 1.4, 2, 2.8, 4, 5.6 available in full article