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EXCERPT page containing first few paragraphs. 2019-01-22 09:53:54

Nikon D850
Sigma 14-24mm f/2.8 DG HSM Art

Aperture Series @ 22mm: Rising Sun Strafing Bedded Sandstone, Zion

This aperture series looks at overall sharpness, but in particular field curvature and how it might be wise to modify the choice of focus given the behavior. Other aberrations are also looked for, such as focus shift and color fringing.

Aperture Series: Sun Strafing Sandstone

Adobe Camera Raw View ACR settings. Camera Profile=Adobe Standard. Diffraction mitigating sharpening for f/9 and f/13.

What high-resolution digital should make clear is that there is precious little depth field at f/2.8—that is a given. What is not a given is what exactly happens to peripheral sharpness wide open and stopped down—how it changes or does not change (focus shift). Focus shift appears relatively mild with stopping down, arcing forward (closer to the camera), and rearward in central areas. It’s not a an ideal scene to evaluate the behavior but some seems to be present. It is a typical tradeoff in a lens of this type.

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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 28 megapixels filling up to 5K display, 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 2.8,4.5,6.3,9,11.1,13 available in full article

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