Geoff, not sure about pixels and that sort of stuff, but I giude with a Philips Toucam through a WO 80mm FD scope, which is all hooked up to the G11, never had any problems to date and it dose a really good job.
However there are times when it is a bit hard to find a guide star in certain areas of the sky, but on the whole it is pretty accurate.
Having said that I have now invested in a Orion Star Shoot for the G11, which will be able to pick up more stars, as it is a bit more sensitive than the Web Cam.
Leon
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