EXCERPT page containing first few paragraphs. 2023-03-29 16:12:52
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Distortion for Leica 35mm f/2 APO-Summicron-M ASPH
The Leica 35mm f/2 APO-Summicron-M ASPH shows a wave-type distortion of 1%, dominated by barrel distortion for the central 2/3 of the frame.
Wave-type distortion is fairly undesirable because it is the most difficult to correct well. And it just plain looks crappy when straight lines are involved. But if the raw converter has a solid lens profile, one click should do it.
While 1% distortion of the Leica 35/2 APO is low, the Zeiss ZM 35mm f/1.4 Distagon has only half that at 0.5% wave-type distortion. That’s the difference between mandatory correction for things like architecture, and not needing it most of the time. And the Zeiss ZM 35mm f/2 Biogon is effectively distortion free.
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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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