Quote:
Originally Posted by blackbetty50
The screen on PHD is a grey colour and not black with the stars in relief is this correct?
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That sounds like you are using too long an exposure, and possibly not doing any dark frames. As Peter says, the guide star must not be saturated, and has to be a star (planets are not a point source).
Keep reducing the exposure until the grey is as dim as you can get it. The stars should still be enough for PHD to use them.