EXCERPT page containing first few paragraphs. 2023-03-21 16:16:48
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MTF: Zeiss ZM 21mm f/4.5 C-Biogon
Contrast wide open is already quite high, declining gracefully to the edges an corners.
Stopping down to f/8 drops overall contrast due to diffraction, but does raise contrast on fine structures in the mid zones and corners/edges. Perhaps f/5.6 would deliver a small improvement to the edges and corners and without the overall contrast drop from diffraction.
But the bottom line is that performance varies only a little, and that depth of field is the real consideration.
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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.
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- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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