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Most lenses allow IR to pass through, however there are many possible pitfalls. Some lenses exhibit more flare, internal reflection, and iris-shaped hotspots in the image centre.
The best performance is typically found where the lenses were designed with IR film in mind. Many decades-old stills lenses have a specific IR focus dot marked on the barrel. This is a useful indication that IR performance will be good.
If IR is being used in order to capture covert or wildlife images, where light levels are typically low, care should be taken to avoid modern cine and TV lenses, which often have IR cut coatings that can reduce sensitivity to IR by as much as four stops. For IR, old is good.

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