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>> Have you made one yet? The guide indicates to me the film should be >> overexposed colour film - eg the places where the negative is black. >> > > There are proper filters for it - eg Wratten *#87* or *#89* - opaque to visible light, passes IR. Might be overspecified to use one, espec if it is 50-60mm wide, but some of them are made as sheets and there used to be Cokin filters, probably still are. > Yes, several times. The website is my brother in laws - we dreamed up the idea > a few Christmases ago and began experimenting with simply filtering the light > with different things to see what would work. Geoff (the BiL) then dismantled > a cheap webcam to discover that the filter within the camera which blocks IR > is simply a square of tinted glass in many cases. > The film needs to be exposed but developed. We found that on many negatives, > there is a small area at the start which is usually exactly what you want. As > you say, it looks totally black. Thats the stuff you want - generally we find > two squares of this filter is ideal. > The hardest problem is finding an IR light source to test it with - although > of course a remote control works fine for that. > Geoff has converted a digital camera for the same purpose, but I haven't got a > spare one myself to hack up! Think he bought his on ebay and once it worked > in IR he did some more hacking on it - fiddling with long lenses etc. > > Mark > > -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html