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Kerry before you start give consideration to the total cost of a modified webcam vs a ready made camera with similar capabilities. I've got a SPC900NC but by the time you modify the housing, add in an adaptor, add an IR filter (and I've not tried to do the long exposure mod yet) the price adds up. If you do want long exposure the mod circuits I've seen rely on a parallel port (which most modern laptops don't have so you would need a USB to true bi-directional parallel port adaptor).
The initial price can be deceiving.
Bob
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