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EXCERPT page containing first few paragraphs. 2021-12-04 15:03:22

Canon 5DS R
Canon EF 24-70mm f/2.8L II

Correcting Lateral Chromatic Aberration and Distortion (24-70mm f/2.8L II @ 24mm, Barcroft Army Boxes)

At 50 megapixels, the Canon 5DS R reveals optical imperfections that the 22-megapixel Canon 5D Mark III tends to minimize, the 5DS R having 1.5X greater resolving power over the 5DM3.

The Canon 24-70mm f/2.8L II is an excellent lens, but when megapixels go from 22 to 50, its latent lateral chromatic aberration which was relatively hard to spot at 22 megapixels reveals itself much readily at 50 megapixels.

Canon’s Digital Photo Professional has a variety of built-in lens correction for Canon EF lenses, but its ancient sharpening algorithm is a turn-off for your author—it cannot extract the fine details, delivering ham-fisted coarse sharpening via Unsharp Mask. So that rules it out for your author, not to mention integration and workflow issues.

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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.

Variants uncorrected,corrected_laca,corrected_laca_distortion available in full article

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