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Zeiss Loxia 35mm f/2 Biogon

MTF for Zeiss Loxia 35/2 Biogon

MTF wide open shows modest contrast even in the center and across the field, but stopping down to f/5.6 shows very high performance equal to the very best lenses.

The big jump in contrast at center from f/2 to f/4 suggests that focus shift has been minimized.

On high resolution digital, f/2 looks to be best suited for pictorial effect, just as with the ZM 35/2 Biogon. Stop down one stop for a big boost in contrast, with f/4 near optimal.

Micro contrast by f/4 is at world-class levels in the center. The lower contrast elsewhere almost certainly is lower in the same plane, but probably just as good as the center—just at a slightly different distance (mild field curvature).

In short, real world images should show high brilliance and bitingly sharp detail. Still, if shooting a flat building straight on, a distant horizon, a group of people (“planar subjects”) stopping down to f/5.6 or f/8 is advised in order to have the sharpest zone of focus apply more uniformly at the same distance—level it out. Compare f/4 to f/5.6 to see this in action; f/8 would drop peak contrast slightly but be even more uniform (in the same plane).

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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.

Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.

  • Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
  • Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
  • Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
  • 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.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.

Aperture series 2,4,5.6 available in full article
MTF for Zeiss Loxia 35mm f/2 Biogon

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