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It sounds like the guide stars you've chosen aren't sufficiently bright for it to lock on to. Set the SPC900NC to its max exposure and use the "Take Dark" feature. PhD prompts you to cover the lens, takes a dark frame, and then subtracts it from each of the displayed video frames, reducing noise in the image. You could also experiment with 2x2 noise reduction (in the "brain" menu). Even so, you will be limited to bright guide stars.
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