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Canon 16-35mm f/2.8L I and II

Very sharp images in central 2/3 of the frame, with detail becoming smeared near the corners even at f/11. Sample quality varies widely. Hot spots become troublesome by f/8, with shorter focal lengths more problematic.

Canon 16-35 f/2.8L hot spots (original model)

Hot spots are pronounced. Stopping down beyond f/5.6, particularly in difficult lighting, usually produces unacceptable results, though the red and green channels might be usable. Behavior is essentially the same as the 16-35mm f/2.8L II.

Canon 16-35 f/2.8L (original model) Backfocus

Overall, the 16-35mm f/2.8L offers remarkable focus, achieving excellent accuracy without filtration.

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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.

EF 16-35mm f/2.8L II, 21mm @ f/9