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EXCERPT page containing first few paragraphs. 2023-03-25 04:14:37

Conclusions on Mosaic Comparisons —

This mosaic comparison used the Nikon D3x, a 24 megapixel DSLR with ~ 5.6 micron pixels — a challenge for any lens.

This comparison also has its limitations: the lenses were effectively at infinity focus. Performance at other distances can change significantly, as can field curvature, and the combination of focal length and focus distance is endless.

Summary of aperture performance

Apertures f/2.8 and f/4 vary in performance by lens and focal length, ranging from poor to outstanding. Review the crops for details, and lens notes below.

Apertures f/5.6 - f/8 produces very good to excellent results with all the lenses in most every case. When edges and far corners are included, aperture f/8 is your safe bet most of the time, though certain focal lengths and lenses benefit from f/11, at the cost of a very slight loss of micro contrast for the entire image.

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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.

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