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Sigma 50mm f/1.4 DG HSM A

Aperture Series: Backlit Bristlecones (5D Mark III)

The strong contrasts and and background objects along with relatively uniform subject matter across the frame from left to right yield insights into the imaging quality of the Sigma 50/1.4A including sharpness, bokeh, color aberrations and other aberrations and any propensity to focus shift or field curvature. The subject is distant enough that it can be called an infinity focus shot (focus was on the prominent tree at left).

Backlit Bristlecones

The lens was shaded from direct sunlight, so this is not a flare test.

Image quality is strikingly clear wide open at f/1.4, showing a very low level of secondary color errors and no visible hazing from spherical aberration or longitudinal chromatic aberration. The near absence of such optical aberrations accounts for the striking clarity.

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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.

Aperture series 1.4, 2, 2.8, 4, 5.6, 8, 11, 16 available in full article

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