There are IR (hot) filters in most digital cameras, however in most cases they are fairly weak and designed to block the levels of near visible IR light expected in the environment. Shining an intense IR beam at a camera fitted with a typical filter will still cause enough glare to effectively defeat it. We can expect few people without photo passes to be bringing in full sized SLRs with strong hot filters and the ability to adjust exposure compensation, so bathing the audience in a wash of intense IR light for a couple of hours should work. The lawsuits for retinal burns and corneal ulcers may be unwelcome however.
Biting the hand that feeds IT
