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EXCERPT page containing first few paragraphs. 2020-07-07 21:24:44

Pentax K3 II
Sigma 35mm f/1.4 4 DG HSM Art

SuperResolution: Checkerboard Effect

Tested with the Sigma 35mm f/1.4 DG HSM Art for Pentax K (about $899) because quality with the PENTAX smc FA 31mm f/1.8 Limited was unacceptable.

Ironically, when I go looking for higher image quality (Pentax SuperResolution pixel shift mode), literally the very first frames I shoot show a problem.

The very first six frames I shot on the Pentax K3 II all show this issue; I shot an aperture series from f/1.4 through f/8 at shutter speeds from 1/200 sec @ f/1.4 to 1/8 sec @ f/8. The example shown here is from f/8, but all other shutter speeds and apertures show an identical problem, so the aperture and shutter speed are not at issue.

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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.

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