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MTF: 75mm f/2.4 (2.5) Summarit-M
The 75mm was originally released as an f/2.5 lens. In 2015, it was re-released in an f/2.4 version, including a silver finish mode, which Leica states offers improved optical performance (in unspecified ways).
The 0.1 stop speed gain was accomplished with certain internal changes, according to Leica. Also according to Leica, the design was tweaked slightly, but the optical design remains the same.
Field use shows very high sharpness by f/4, but what MTF charts do not show is a disappointingly weak control of veiling flare, even with the len hood attached—this serves to greatly reduce contrast in some shooting situations. Shield the lens from any bright light souce that might strike the front element—even bright sky is an issue under some circumstances. Not doing so means that MTF will be much reduced with localized flare “‘hot spots”.
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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.
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- 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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