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I was surprised to find out how small a piece of dust is needed to put a spot on the image. I kept finding a couple of spots coming out on my images yet couldn't see anything when I looked. I then got out a magnifying glass and checked, and sure enough there were two small spots of dust that "looked" pretty much transparent, but were enough to affect the image. Removed them and no problem, and they weren't transparent, just dark coloured (looked transparent on the dark chip).
One of the problems I found with the ToUcam was that when I removed the original lens and screwed in the adapter, the metal thread of the adapter shaved small pieces of plastic off the ToUcam thread which then deposited onto the CCD. This is a pain as after I remove the adapter and clean the CCD, I then have to be very careful rethreading the adapter as more bits of platic then come off. At Least with the LPI both threads are plastic so this shouldn't be as much of a problem
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