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EXCERPT page containing first few paragraphs. 2019-09-22 06:06:21

Nikon D850
Sigma 40mm f/1.4 DG HSM Art

Aperture Series: Blowing Snow on High Peaks

This far distance series evaluates lens performance from f/1.4 through f/11, evaluating sharpness across the frame as well as secondary color correction.

Images at sizes up to full camera resolution.

Blowing Snow on High Peaks

Adobe Camera Raw view ACR settings. Camera Profile=Adobe Color. No lens corrections used. Diffraction mitigating sharpening use for f/11 (minimal).

Focus was on the far hillside at f/1.4. This proved harder than I might have thought in the extreme lighting; it’s uncertain whether I managed it optimally. The best actual focus might be nearer, e.g., the more distant area of the open foreground field. Given the rearward focus shift of the Sigma 40mm f/1.4 DG HSM Art, this may have been fortuitous in that f/2 and f/2.8 shift a bit rearward to “land” on the hills beautifully all while preserving peak sharpness from in front of the aspen to the far distance (but not improving the nearby foreground, due to the focus shift). The results at f/2.8 are as good as most lenses every achieve! By f/4 - f/5.6, even the closest foreground is spectacularly sharp, a world-class performance.

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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 1.4,2,2.8,4,5.6,8 available in full article

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