Night Vision Lens For Canon Camera

Sandy asks…how to see infrared light from a infrared LED?i have seen videos on making a night vision glasses in many sites(one of those is "http://www.youtube.com/watch?v=-ikNaWJ3IDE" with ULR "http://www.youtube.com/watch?v=-ikNaWJ3IDE"). but the common thing is a congo blue gel sheet and a primary red gel sheet. what are these sheets? are these any kind of polaroid sheets? can we use normal glass sheets (blue and red) that are available in market, for these purposes?mr.eos answers:How To

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