EXCERPT page containing first few paragraphs. 2023-12-06 16:09:12
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90mm f/2 APO-Summicron-M ASPH
The 90mm f/2 APO-Summicron-M ASPH is hit and miss with rangefinder focusing M9; the precision required really is pushing the limits of the accuracy needed for high resolution digital. But on the Leica M Typ 240, the 90/2 APO pops into or out of focus beautifully using Live View, and focus precision can be guaranteed just about always.
The 90mm f/2 APO-Summicron-R ASPH is identical optically, but it requires the use of the Leica R-Adapter-M. Your author prefers the build of the R version, but the need to use the adapter is not a plus.
Construction
Optical efforts are robust, but perhaps the 75mm f/2 APO takes it one step further by adding a flloating lens element for close-range quality, which the 90/2 lacks:
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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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