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On Friday 30 March 2007 14:59, Adrian Midgley wrote: > >> 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. > A quick Google shows me that Kodak do a filter which can be cut down to suit perhaps - http://www.x-raycameras.com/kodak_wratten_87_range.htm May be worth having a look at. Seems they are gelatin based - so, does that mean they would be soft and thus perhaps end up with finger marks all over them whilst attempting to fit them into a webcam I wonder.. Will have to get hold of one and see I expect! Thanks again for the info Adrian - a new angle to explore! 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