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Pentax K3

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K3 Autofocus Accuracy

All cameras and lenses with phase detect autofocus (conventional autofocus) have factory tolerances for accuracy. With high resolution digital sensors, the tolerances must rise due to the extreme pixel density: the 24MP sensor in the Pentax K3 has a pixel density equal to a 56MP sensor on full frame.

One can fairly ask a simple question: if a brand-new camera and brand-new lens are acquired, shouldn’t the focus be close to perfect? Unfortunately the answer is generally “no”, because the factory tolerances are not particularly tight, and because a lens error and a camera error can be additive or subtractive; a small error plus another small error in the same direction mean an unacceptable result.

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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.

f/2.4 @ 1/20 sec handheld anti-shake
ISO 100 + 0.5 push, Contrast +40, Highlights -40, Shadows +100
Pentax K3 + Pentax 70mm f/2.4 @ f/3.2

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