EXCERPT page containing first few paragraphs. 2023-03-21 16:49:16
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Performance is high wide open at center with good sharpness across most of the frame, declining towards the edges and dropping off markedly to the corners. These variations are likely mostly a field curvature; actual performance may be higher (just not in a plane).
Stopping down to f/5.6 shows an overall increase in performance that is well worthwhile in total. However, the outer zones near the edges change very little while the corners improve markedly. This may be a balancing effect of the design, with some small focus shifts going on in the outer zones. Or perhaps not, since f/8 does not improve matters.
According to Leica:
For the 2/28 and 2.8/28 2016 lenses, minor changes in the lens positions have been made that improve the contrast and resolution performance when being used on digital cameras. The MTF graphs in the technical data show the pure lens performance independent from the sensor or film, so the improvements are not readily visible. But on actual M or SL or Sony cameras, much better details and contrast will be seen, especially in the corners. Focus shift is on the same level as before.
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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.
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- 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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