I can't seem to get a straight answer on this. To make an IR filter out of photofilm, should it be exposed and developed or UNexposed and developed?
Logic tells me overexposed film will pass less visible light, but there are fairly scientific writeups here that contradict each other.
http://www.photocritic.org/2006/create-your-own-ir-filter/
http://northcountryradio.com/Articles/irfltr.htm
http://www.rit.edu/~andpph/text-infrared-filter.html
Logic tells me overexposed film will pass less visible light, but there are fairly scientific writeups here that contradict each other.
http://www.photocritic.org/2006/create-your-own-ir-filter/
http://northcountryradio.com/Articles/irfltr.htm
http://www.rit.edu/~andpph/text-infrared-filter.html
