EXCERPT page containing first few paragraphs. 2021-04-13 03:23:14
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Leica supplies MTF for f/1.3 (not f/1.2)... is it a typo or is it actually f/1.3?
Leica supplies fantasy MTF for its lenses. That is, the MTF is computed (not measured) based on a computer model, not a real lens. Moreover the data is not corrected for the ray angle effects of a digital sensor. Accordingly, real MTF is unlikely to be as good as Leica presents, particularly at wider apertures.
At f/1.3, MTF of the Leica 50mm f/1.2 Noctilux-M ASPH shows reasonably strong contrast for coarse structures but with field curvature showing a large dip not far away from center. Medium size structures have very modest (poor) definition with a wild variation presumably due to field curvature. Fine details effectively do not exist at f/1.3.
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Diglloyd Guide to LEICA contains in-depth coverage of Leica M system cameras and lenses, with additional coverage of Leica M Monochrom, Leica Q, Leica SL.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
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- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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