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Pentax K-1
Pentax 15-30mm f/2.8 ED SDM WR

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Aperture Series @ 30mm, with Pixel Shift: Mosaic (Pentax K-1 SuperRes)

This finely detailed scene at far focus distance is an exceptionally demanding subject that makes mincemeat of most lenses, mercilessly revealing every weakness, lack of symmetry, etc. Most lenses require f/5.6 or f/8 to sharpen the whole mosaic.

Here at 30mm, the Pentax 15-30mm is less good than as seen at 15mm and at 21mm—it appears that 30mm is the “weak end” of the zoom range.

Assessed here in particular are the results at f/13, which are typically slightly marginal from diffraction on both the Nikon D810 and the Canon 5DS R. But the Pentax K1 SuperRes pixel shift mode preserves micro contrast extremely well and is thus very interesting at f/13.

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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 2.8,4,6.3,9,13 available in full article

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