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Autofocus

Shooting in infrared introduces an inherent focus error problem. In most cases, autofocus does not focus accurately enough for critical sharpness, and in many cases it is so much in error that at least f/8 might be required to obtain a usable image. In general, you cannot rely on autofocus for critical sharpness, though there are certain magic combinations.

Autofocus tip for Canon EOS 5D-IR

In some cases, autofocus accuracy can be greatly improved through the use of filters. Please see Focusing—Autofocus Tip.

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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.

Actual pixels
Canon 5D-IR with Nikon 300mm f/2.8 ED-IF AF-S Nikkor (original version)

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