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Left: aspherical glass element from SIGMA 18-35/1.8 DC HSM Art
Right: aspherical glass element from SIGMA 20/1.4 DG HSM Art
Sigma 20mm f/1.4 DG HSM A

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Overview of Sigma 20mm f/1.4 DG HSM Art

The Sigma 20mm f/1.4 DG HSM A debuted in November 2015. At about $899, it offers performance superior to the Canon and Nikon competition, at 1/2 the price or less—a stunning value. Except that neither Canon nor Nikon nor Zeiss offers a 20mm or 21mm f/1.4; the only other company to do so is Leica with the 21mm f/1.4 Summilux-M ASPH, at about 8X the price and it’s a rangefinder lens unsuitable for a DSLR.

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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 full camera resolution, plus large crops [past 2 years or so].
  • 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 Nikon or on Canon or on Pentax.

Optical design of Sigma 20mm f/1.4 DG HSM Art: large diameter aspheric, rear aspheric, 5 SLD glass, 3 FLD glass

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