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While the newly-announced 50mm f/2 APO-Summicron-M ASPH looks to be the finest lens ever developed for the M and no doubt will be superlative on the Leica M Monochrom, the beauty of shooting in black and white is that appropriate filtration could in theory improve lens performance quite significantly.
The catch? A shift of focus that occurs, just as when shooting with infrared. This shift occurs even with a yellow filter. With no Live View and no means of checking critical focus, the Leica MM presents a technical challenge if one wishes to use filtration.
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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.