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you can get away with a webcam. I used a ToUcam 840 and 900 successfully for ages. However the more sensitive, the more stars you have to select from. Probably of more use is the ability to have a longer exposure time. The ToUcams (unmodded) were limited to 1/25 sec. Being able to jump up to 1 or 2 secs is a big advantage.
Noise is also an issue at times, but using something like PhD give you the option of taking darks with can make a big difference, even with a toUcam
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