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Aperture Series: Barcroft Sensor Building (M240)
The “R” and “M” version of the Leica 90mm f/2 APO-Summicron ASPH are optically identical. There can of course be minor differences due to mechanical variation, but the optical formula is the same, as the MTF chart shows. s
Because your author owns the “R” version, many examples for the 90/2 APO ASPH are shot with the 90mm f/2 APO-Summicron-R ASPH using the Leica R-Adapter M.
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Barcroft Sensor Building aperture series with 90/2 APO-Summicron-R ASPH.
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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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