I hope this question is a little "beyong the basics" and that I'm not still stuck as a beginner. But I've seen people doing a lot of IR photos lately and I need a little clarity of IR methods. I'm assuming IR film is neccessary to do IR photography, but I'm hearing about IR filters. Can someone explain filters to me? If I remember correctly, I remember a friend saying something about using a red filter when shooting IR photography...maybe?