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MTF: 75mm f/2 APO-Summicron-M ASPH
MTF of the Leica 75mm f/2 Summicron-M ASPH is highly satisfactory across the frame at f/2, with a wave-type effect similar to the 35/1.4 and 50/1.4 Summilux in the mid zones, but much less pronounced, showing a more uniform quality across the frame.
Stopping down to f/4 raises contrast to very high levels, but on critical planar subjects one might notice slight loss of contrast about 2/3 of the way out; this is likely a field curvature; stop down to f/5.6 to be certain with planar subjects (building, groups of people, etc). On 3D subjects, ignore this as an issue.
Field shots show that peak performance on the Leica M240 requires at least f/5.6, and even f/8. This variance to the MTF chart is unclear, but the behavior is not that impressive in the field in the f/2 to f/4 range.
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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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