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EXCERPT page containing first few paragraphs. 2021-12-08 17:46:17

Sigma 50mm f/1.4 DG HSM A

Near/Far Focus Series: Tuolumne River Cascade (5D Mark III)

This dual-focus series provides insight into lens performance but also serves as a tutorial of sorts for choice of focus: this scene has a large near/far depth, so what can one hope for in sharpness and where might ideal focus be found?

Also shown are the point spread function and color correction behaviors; the dual focus lends an instructive perspective to the range of behavior that might be expected with different amount of defocus.

Tuolumne River cascade

June 15, 2014: water levels are much lower than normal flow; in many years your author would have been swept away by raging flows from this position.

Image quality is not at its best wide open, but is nonetheless strikingly transparent, showing the potential for focusing the viewer’s attention onto a desired area of the subject.

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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.

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