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EXCERPT page containing first few paragraphs. 2021-12-04 13:57:40

Sharpness Example over Aperture Range

This page shows the sharpness and contrast possible with outstanding optics.

Since this is a camera evaluation, the focus here is on sharpness across the aperture range, and how soon diffraction comes into play in light of the 5.7-micron photosites. The entire frame was examined, and found to crispy-sharp even wide open at f/2, even in the far corners. This is expected with the Zeiss 100/2 Makro-Planar.

Modulation transfer function (MTF) and 1D Mark IV resolution

See MTF and how to read an MTF graph.

The optical resolution required for the 1D Mark IV slightly exceeds that of the 24MP Nikon D3x. Thus, it is very demanding of optical performance. In particular, a lens must deliver not just resolution, but high micro contrast in order to produce results that look sharp.

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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.

Entire frame as shot

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