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EXCERPT page containing first few paragraphs. 2023-02-08 01:31:07

Leica 28mm f/2 Summicron-M ASPH (2016)


Performance is very high at center, but drops off steadily and by a considerable degree to the edges. Like its predecessor, the 28/2 Summicron-M ASPH is far from an ideal lens at f/2 for distance shots, or buildings straight-on, or groups of people: sharp center but a much less crisp mid zone and periphery.

Stopped down from f/2 to f/2.8, the performance improves moderately across the entire field which is as one would hope, but the improvement is not large, suggesting a possible slight focus shift. Going to f/5.6 delivers very high performance over most of the frame, though the area approaching frame edges and corners shows little improvement; it could be a peripheral focus shift and so field shots are warranted to explore that idea.

The MTF charts, particularly from f/2 to f/2.8 are at odds with actual results; they are not credible when real images are examined: focus shift is severe. It’s unclear how these charts can be delivered by Leica in the face of such damaging real-image evidence to the contrary.

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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.
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  • 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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