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Kieth, I'm using a QHY5 guide camera and with Maxim DL I can easily guide out to 30 minutes... I've guided a 60 minute shot in the past that still had very tight round stars, the only problem was the 22 satellite trails through the image..
I never had much luck guiding using a GPUSB, I think it had some sort of conflict with hardware/software being used... The QHY5 has given me much better results so far.
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