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Resolution from Diffraction —120/4

Here we examine the progression in image sharpness and contrast from f/4 through f/22 on the Hartblei 120/4. Lens design has subtle interactions with diffraction, and some lenses do hold up slightly better than others; the Hartblei 120/4 holds up exceptionally well when stopped down.

This subject, the power-coated metal surface of a storage rack, was chosen because of its “fractal” nature and its contrast. The 24.4MP Nikon D3x was used for this test.

Aperture series

The subtle graying of detail is visible even by f/8, as is expected with any top-quality lens (lesser lenses start out crappy and improve by stopping down to f/8 or f/11).

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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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f/4

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