EXCERPT page containing first few paragraphs. 2017-01-22 08:12:36
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If one can compensate for the shift in focus, use of a yellow/orange/red filter can in theory improve image sharpness by eliminating other wavelengths of light.
In practice, the Leica MM provides no feasible (quick and reliable) means of compensating for the shift in focus that occurs with yellow/orange/red/deep red filters. The absence of a Live View facility and the awful image zoom quality post-shot mean that there is no reliable mechanism in the camera to check that focus is critically sharp.
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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.