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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 for monochrome and in infrared. It is not a review of any particular camera or lens, though many examples are included.
- Monochrome vs color cameras.
- Post processing for monochrome.
- 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.