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EXCERPT page containing first few paragraphs. 2021-09-26 02:06:33


This subject was chosen due to its rectangular and symmetric nature which readily reveals lens distortion. 

At least 10 minutes were spent leveling the camera as precisely as possible and ensuring left-to-right symmetry.  This is rather difficult using a 2/3 frame camera with its small viewfinder, even using Nikon's “Type E” focusing screen, which contains extra grid lines.  Even looking through the viewfinder at a slightly different angle changes the apparent coverage slightly.  Alignment was very close, as good as could be achieved.  A Photoshop rotation of -0.22 degrees levels the image horizontally, determined by using the center frame from the Schneider lens, and rotating until symmetry was achieved on the far right and far left of the center frame.   The -0.22 degree rotation was confirmed as accurate using the center frame from the PC-Nikkor 28mm/f4.

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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 Schneider, Nikon 28/4, Nikon 28/3.5 #186xxx, Nikon 28/3.5 #188xxx, Nikon 28/3.5 #208xxx available in full article

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