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MTF for Sigma 85mm f/1.4 DG HSM Art
Sigma publishes MTF for f/1.4 only without disclosing the type of light or focusing distance and so on. The MTF is worth discussing because it is at odds with what actual performance from the lens delivers when shot in the field.
The Nikon AF-S 105mm f/1.4E ED is a new lens released not long before the Sigma 85/1.4, and yet the Nikon 105/1.4 shows none of the odd behavior of the Sigma (and both were shot on the same camera).
MTF discussion
The Sigma MTF chart shows a world-class (for f/1.4) flatline contrast curve nearly to frames edges. Really outstanding. Theories are nice, but what about real lenses?
The Sigma MTF chart suggests that the Zeiss Milvus 85mm f/1.4 will be obviously inferior in its MTF at f/1.4, and yet field comparisons repudiate that idea.
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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
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- 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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