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MTF for ZM 35mm f/2.8 C-Biogon
Wide open at center, contrast is outstanding and at peak levels (does not improve with stopping down). Focusing in Live View is particularly pleasant with this high performance.
Stopping down to f/5.6 delivers high performance across the frame, albeit with the undulation as seen in the chart; this is field curvature. Quite likely the performance is near peak levels nearly everywhere in the frame, just not exactly in a geometric plane.
Astigmatism is very well controlled; the nearly overlapping sagittal and tangential curves suggest a high level of control of lateral chromatic aberration — likely a complete freedom from color fringing.
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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.
Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.
- Make better images by learning how to get the best results right away.
- Save money by choosing the right lens for your needs the first time, particularly the Summilux/Summicron/Elmarit choice and/or Zeiss ZM.
- Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning. Processing parameters are discussed and shown.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
- 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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