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EXCERPT page containing first few paragraphs. 2023-03-25 03:16:39

Zeiss Loxia 21mm f/2.8 Distagon

MTF for Zeiss Loxia 21/2.8 Distagon

MTF wide open shows world-class contrast in the center, declining steady and gracefully across the frame (which is at least partly a mild field curvature).

In the central 1/3 or so, performance is already near-optimal wide open at f/2.8. Peak performance is nearly reached by f/4, but f/5.6 smooths out the field, which has some field curvature (focusing closer at the periphery than the center aka “forward field curvature”).

The use of f/8 will deliver a bit more depth of field, but it does not improve upon the outstanding quality at f/5.6; it actually declines a little overall from diffraction. Similarly, f/11 dulls the image significantly over f/8 (compare f/8 to f/11 and see all curves drop). However, the use of diffraction-mitigating sharpening for f/11 can yield images as good as f/8 (or very nearly so), but increased depth of field; see Mitigating Micro Contrast Losses from Diffraction Blur. That extra depth of field can matter little or matter signficantly; see the crops in the Orange Tree Trunks example.

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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.

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  • 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 2.8,4,5.6,8,11,16,22 available in full article
MTF for Zeiss Loxia 21mm f/2.8 Distagon

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