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EXCERPT page containing first few paragraphs. 2020-09-19 12:47:08

Canon 5D Mark III
Sigma 24mm f/1.4 DG HSM A

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Aperture Series: Magenta Flower (Canon 5DM3)

Like the Bird of Paradise series, this series is at the near focusing limit of the Sigma 24mm f/1.4 DG HSM Art, 1:5.3 magnification. But in this case, a “noisy” background was intentionally included to show off blur qualities on more varied subject matter.

Magenta flower

Adobe Camera Raw 8.8.0 (397). ACR settings. Camera Profile = Camera Neutral.

Stopped down to f/4 - f/5.6, peak contrast is seen on the fine interior detail of the flower, showing that the f/1.4 - f/2.8 range is at lower levels of contrast; it probably is reduced performance because of the very close focusing range. But at the same time, secondary color aberrations seem to be absent, reaching best of the best levels—impressive. There is no evidence of violet haze either (longitudinal chromatic aberration), though the lower contrast at f/1.4 probably indicates some residual aberrations, possibly just a hint of spherical aberration (at greater focusing distances this likely disappears).

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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 1.4,2,2.8,4,5.6,8,13,16 available in full article

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