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Sigma 50mm f/1.4 DG HSM A

Optical Construction of Sigma 50/1.4A

Optical construction is extraordinary for a 50mm lens, using 13 elements in 8 groups.

The five extra elements including three of special glass type and one aspherical element go far beyond conventional design for a 50mm lens. Accordingly, very high optical performance should be expected.

The Sigma design is a brilliant positioning in the marketplace: aiming for very high performance at a price substantially higher than conventional 50mm f/1.4 lenses, but about 1/4 that of the manual focus Zeiss Otus 55/1.4, and about 60% that of the Canon 50mm f/1.2L, whose extra half stop offers minimal (f any) actual brightness gain on digital sensors.

The combination of price and performance has no competition as of mid 2014. It’s a “sweet spot” in price/performance that Canon and Nikon seems oblivious to, having delivered medicore normal lenses for decades.

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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 construction of Sigma 50mm f/1.4 DG HSM A

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