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Canon EF 35mm f/2 IS

Focus Shift, Close Range

Shot with the Canon 5D Mark III at ISO 100, tungsten lighting.

The Canon EF 35mm f/2 IS has somewhat low contrast wide open even in the center, which hints at possible spherical aberration. With spherical aberration responsible for focus shift, it seems prudent to check for its presence, even though an f/2 lens usually has little focus shift.

This test is at close range; behavior is not necessarily the same at greater distances, but it is harder to detect at distance.

Aperture series (crop)

The crop shown here is from the dolls 35mm comparison.

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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.
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  • 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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Variants f2,f4 available in full article

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