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Canon EF 300mm f/2.8L
Capable of critically sharp images in infrared even wide open, it also has perfect focus accuracy with my 5D-IR, indicating outstanding correction for chromatic aberrations, which apparently includes infrared. In short, it can be shot wide open at f/2.8 and yield outstanding sharpness.
Field use showed that hot spots are a problem by f/11, especially if the lens is not carefully shielded; the lens hood is absolutely mandatory and light must not strike the front element. Still, hot spots can be a real problem in high contrast situations, as seen below. Sometimes this can be dealt with by avoiding the blue channel. See Hot Spots.
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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.
