EXCERPT page containing first few paragraphs. 2017-04-28 06:57:51
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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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Since 2009, Diglloyd Guide to Leica is the authoritative review and reference for Leica M lenses: Leica M, Zeiss ZM, Voigtlander, as well as Leica M digital bodies. Leica S is also included.
It includes hundreds of pages of exclusive coverage and high resolution Retina-grade examples covering Leica M-System lenses and digital bodies with in-depth performance comparisons and analysis.