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I used a ToUcam, and a means of interfacing it to the PC, (not GPUSB), it worked and well. I now use a QHY5, and while it seems more sensitive, I can't seem to achieve the reported "2sec exposure will find guide-stars anywhere". Maybe it is the way I use it. I still adjust the guide-scope to find a brighter guide-star.
You could do worse by simply starting with a ToUcam, as unless you own one it is also handy for lunar and planetary as well.
GGary
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