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Sigma 40mm f/1.4 DG HSM Art

MTF

Sigma supplies MTF only for f/1.4 and only at 10 and 30 line pairs per millimeter, which is odd in the year 2019 where digital cameras like the Nikon D850 hit 116 lp/mm. Zeiss uses 10/20/40 lp/mm, which is better, but still low compared to camera requirements. Setting that aside, the MTF looks fabulous, though it is lower at f/1.4 than the MTF of the Sigma 40mm f/1.4 DG HSM Art—28mm is a more challenging focal length than 40mm.

Field curvature and astigmatism wide open at f/1.4 appear to be tightly controlled, with performance dropping off gracefully.

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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.

  • 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 some of the new Sigma Art lenses vs Nikon and Canon.
  • Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to 28 megapixels filling up to 5K display, plus large crops [past 2 years or so].
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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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MTF at 10,30 line pairs per millimeter for Sigma 28mm f/1.4 DG HSM Art

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