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When reading any page in this review, take your own assumptions and goals into account, and relate those to the discussion to verify that the way the test has been done meshes with your own working habits.

For example, shooting JPEG with noise reduction enabled might produce significantly different results than RAW without noise reduction. Or shooting under mercury vapor lights as compared with evenly-balanced 5000°K lighting (daylight).

Testing and assumptions

The assumptions in testing matter a lot, so much so that a test can be perfectly designed and performed, but inapplicable in some cases. Let’s discuss lens tests to illustrate. The same applies to noise and other areas.

Today the popular trend is to assign numeric values to everything: a lens can be assigned rating(s) based on arbitrary assumptions (assume a flat field, test at close range, etc). This yields a very good idea of how a lens performs under specific circumstances on a test target, and so if you shoot test targets the results are eminently useful and scientifically defensible; variables are held constant (assuming focus and focus shift are accounted for). Unfortunately, real world images don’t work that way.

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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.



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