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Alex
Maybe check the items below
Select Brain then the “Guiding tab”
Increase search region to 15 pixels
Tick Star Mass Detection and set Tolerance to 60
Under Calibration make sure your focal length is set correctly for your guide scope not main scope focal length
For your Calibration select a star within 10 deg of the celestial equator and with 1 hour of the north meridian on the east side
Set your guide camera exposure to 2 seconds, it’s a good starting point
Also the PHD2 manual is a great guide ( under Contents ) I read it a few times and it helped me sort out some gremlins
Good luck
Martin
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