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Zeiss ZM 21mm f/4.5 C-Biogon

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.

Special emphasis is placed on Leica M lenses and certain Zeiss ZM lenses.

  • Make better images by learning how to get the best results right away.
  • Save money by choosing the right lens for your needs the first time, particularly the Summilux/Summicron/Elmarit choice and/or Zeiss ZM.
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  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • 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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Aperture series 4.5, 8 available in full article
Zeiss ZM 21mm f/4.5 C-Biogon MTF

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