EXCERPT page containing first few paragraphs. 2018-05-23 21:28:41
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Wide open, performance is high over most of the frame, but stopping down to ƒ/5.6 pops the contrast to a very high level over the central 3/4 of the frame, with a graceful drop to the edges and corners.
Since MTF ƒ/4 is not supplied, we cannot be sure if most of the gains of ƒ/5.6 are already present, but most likely there are some benefits to ƒ/5.6 over ƒ/4, not the least of which will be concern over focus error, which is almost a certainty with a 135mm lens and rangefinder focusing.
This is a very high performance, but less uniform and less good to the edges and corners as compared with the 90/2 Summicron-M ASPH. The astigmatism that is seen at ƒ/5.6 and particularly at ƒ/8 is apparently due at least in part to lateral chromatic aberration, as per field shots which reveal this color error on higher resolution mirrorless camera bodies.
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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.
- 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 28 megapixels filling up to 5K display, 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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