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Canon EF 85mm f/1.8

A really nice lens in visible light, but with fairly strong hot spots and strong backfocus, not a great contender for infrared shooting.

Canon EF 85mm f/1.8 hot spots

Hot spots are acceptable until f/5.6. Thereafter they are a cause for concern. The Nikon 85mm f/2.8D PC-Micro-Nikkor is a much better choice.

Canon 85mm f/1.8 backfocus

Strong backfocus, even with filtration, makes this lens difficult to shoot. Focusing about 6" in front of the subject whilst using the B+W 091 filter seems to be the best bet. Alternately, the infrared adjustment mark seems quite accurate (see below), offering f/11 resolution at f/1.8.

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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.

The coverage explains all the issues involved in shooting in infrared, which do not change. It is not a review of any particular camera or lens, though many examples are included.

  • Guidance on workflow for infrared, including black and white and channel swapping for false-color images.
  • How infrared renders, and why certain spectral cutoffs matter: false color vs black and white.
  • Image quality issues to be on the lookout for in infrared.
  • Numerous lens evaluations in infrared.

View an overview of infrared as well as filter spectral transmission plus examples from an optimal lens.

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