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Thanks for the response Greg.
The funny thing is that guide exposures of 0.5 flatten that oscillation right down.
I'll give the balance a look at and try the balance to the east.
I had not considered the cam, but I will take a look at that too.
I have used similar Min and Max settings as you suggest and the results go haywire. It's definitely something mechanically to do with the RA. Longer guide exposures make the problem worse. Though the stars are still round.
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