EXCERPT page containing first few paragraphs. 2020-01-17 13:41:49
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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, 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.
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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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