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IR/UV filter
When you are doing the maths on this factor in an IR/UV filter $75+
The IR filter in most webcams is in the original lens assembly which is removed for imaging. I'm using the Philips SPC900NC and working my way through the long exposure mods and thinking about redoing how I've mounted it.
A number of web cam modifiers seem to use old SLR fittings so that they can attach normal SLR lens to the webcam if desired and to simplify swapping fittings. I've currently got a 2" to 1.25" eyepiece adaptor fitted over the purchased screw in eyepiece adaptor to provide greater rigidity. Works well except that I can't use the camera in a 1.25" focusser.
Bob
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