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Hi Alex,
I haven't tried drift aligning with BEOS although I have it, that sine wave is very strange.
can you tell us where you were pointing. did you have tracking at sidereal on?
Were you guiding?
There usually aren't many bright stars near Dec0 and the Meridian, so its good to use the guide camera in the main scope and plot the drift using phd with guiding disabled.
just to clarify, you need to point at dec 0, meridian for the azimuth correction and E or W at around 25deg max altitude for the Altitude correction.
Cheers
Alistair
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