Trevor, Reversal film processed to Dmax as an improvised IR transmitting, light blocking filter, should only be used in front of the camera lens. It will somewhat degrade the images as the film base is not optical quality. On the other hand, a stack of deep Red and Blue filters will not affect image sharpness quite as much ... hardly at all in fact. Placing a gelatin Wratten IR filter behind the mirror in a DSLR may be asking for trouble. In a film camera a piece 24mm x 40mm or so could be taped (with very thin tape) across the image gate and between the film plane rails of the camera. The filter material is so thin that the rails provide enough clearance so that the film does not touch the tape or the filter. Contrast in an infrared image may be low for a variety of reasons. Since you are working digital an adjustment with levels might help. Beyond that curves I guess may help further. Starting out with a knockout image, however, is the best way to go IMO. g'day! andy
Before I bought my D200, I researched the IR possibilities and my search
resulted in the only real negative of the D200 (IMO): really strong ir blocking filter. Your Rebel took 30 sec for an exposure, eh? I have an IR filter that I could try with it. The last time I did, I got a really flat image. Where did you place the filter? I remember reading your(?) notes on using the e6 film for an IR filter, but i got the impression the filter was placed behind the lens. Just wondering how I could adhere it beneath my mirror without completely screwing up my gear. It'every green here in indonesia (a dramatic juxtaposition moving from egypt) and I'd like to find an alternative to buying a second dslr to send to the IR doctor.
