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As Houghy said - look at a dark taken with the camera off the scope, front cap on and viewfinder covered, with the camera in a dark box and what you will see is the amp glow.
The external power supply doesn't get rid of amp glow - the heat of the amp is there regardless of how the camera is powered and that heat is "seen" on the sensor as these pink splodges.
What you do avoid by using the external power supply is the heat that is generated as a LiPo battery discharges causing a similar heating of the sensor.
Certainly impressed with your cluster image - the autoguiding seems to be working brilliantly!
DT
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