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EXCERPT page containing first few paragraphs. 2021-12-08 21:17:43
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Distortion at 17mm

Please see the 17mm comparison page for details.

Mouse over the image below to compare. Both zooms show faint pincushion distortion (bowing inwards), typical for a zoom lens at its long end. But it is so low it can be ignore.

The 17/4L shows the lowest distortion and the most natural looking image.

The 17-40/4L has strong barrel distortion at 17mm, with the 16-35/2.8L II showing somewhat less of it, but both zooms look positively stretched compared to the 17/4L.

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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.

Variants 16_35, 17_40, 17f4L available in full article
17-40/4L <===> 16-35/2.8L II

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