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Zeiss Touit 50mm f/2.8M
(Sony E mount)

MTF for Touit 50/2.8M

The MTF tells a helpful story: lens performance is at its peak at infinity and quality is maintained across the full focusing range from 1:1 to infinity focus.

The consistent performance makes the Touit 50/2.8 a versatile all-around short telephoto lens (75mm equivalent field of view) for general purpose photography to tight head shots (portraits) to closeups of flowers and insects.

MTF at taking distance of infinity

The dip in mid-zone MTF is due to a field curvature. Stopping down raises the MTF in the mid zones. Probably the lens is near optimal wide open, just not in an exact geometric 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 28 megapixels filling up to 5K display, 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 2.8, 5.6 available in full article
Aperture series 2.8, 4 available in full article

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