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EXCERPT page containing first few paragraphs. 2018-06-17 23:02:52

Sigma 135mm f/1.8 DG HSM Art

Aperture Series: Pescadero Creek Downstream (Nikon D810)

This series looks at sharpness across the field, along with foreground and background color correction in out of focus areas.

Images presented at up to full 36 megapixel resolution from the Nikon D810.

Pescadero Creek Downstream

Adobe Camera Raw view ACR settings. Camera Profile=Adobe Standard. No lens corrections used. Diffraction mitigating sharpening for f/9 (minimum) and f/13 (moderate).

This is actually a significant challenge for color correction: bright key areas in quite blue dusk canyon light. With less then perfect correction for violet/blue light, those bluish boulders and bark-free trees and specular reflections would have color haloes and would drop in micro contrast considerably. But the Sigma 135/1.8 just shrugs off the lighting and delivers a brilliant performance in terms of color correction. Check out the foreground blurs on the water at f/1.8 and try to find any meaningfull color errors...nothing one can point to—and then not the smooth bokeh that is free of any hard edges. Probably 98% of lenses on the market today cannot handle this challenge so well.

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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 1.8,2,2.8,4.5,6.3,9,13 available in full article

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