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EXCERPT page containing first few paragraphs. 2019-10-19 03:54:07
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45-megapixel Nikon D850
Sigma 24-70mm f/2.8 DG HSM Art

Aperture Series @ 70mm: Alabama Hills View to Snow-Covered White Mountains

This aperture series at distance shows the performance the Sigma 24-70mm f/2.8 DG HSM Art at 70mm from f2.8 through f/11.

This series is shown reluctantly, mainly for confirmation of the very poor performance seen at the other focal lengths: badly blurred edges. Here at 70mm it is at its worst.

Companies that allow seriously out of whack lenses to ship to customers are offensive. My reward for all the hours spent in non-repeatable rare conditions is crap-grade images. There is no recovery from that. Shame on Sigma for letting a sample like this ship to customers.

Sigma claims to MTF test its lenses. How can a lens so obviously 'off' be shipped to customers? I at least want to give Sigma the benefit of that doubt that this is a bad sample, but how the hell does a lens so bad ship at all? It’s shameful. . Any consumer-grade $99 zoom can beat the garbage performance seen here. Considerable skepticism is needed for Sigma lens quality it seems, on the claims of MTF testing.

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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 2.8,4,5.6,8,11 available in full article

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