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EXCERPT page containing first few paragraphs. 2023-03-29 05:20:08

Nikon D810
Nikon 19mm f/4E ED PC-E

Aperture Series, 12mm shift: Maple Trees in Sunken Area (Nikon D810)

This series with full 12mm fall (downward shift) along the long axis shows just how critical it is to focus the Nikon 19mm f/4E ED PC-E PC-E in order to balance out the field curvature—f/11 does not overcome the behavior.

Shot prior to discovering field curvature issues, this example is excellent in showing what naive choice of focus would deliver. Focus was off only because of the difficulty of discerning peak focus at f/4—the smart move is to scroll in Live View nearer and farther to verify that the zone of focus is where intended—I forgot to do this—f/4 has enough depth of field to make peak focus somewhat ambiguous in dim light.

Also discovered here is a pronounced rearward focus shift, which is even more important than the field curvature of the outer zones.

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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 4,6.3,9,11 available in full article

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