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Paul, last winter, something similar happened to me.
I was shooting the Rho Ophiuchus complex with the modified 40D on an ADM Accessories ballhead mount for Losmandy plates. It was mounted on top of the ZenithStar 80 at the time.
I got 7 hours of data or something close to that. Only to realise when it came time to stack, that, little by little, there was movement as the camera continued to sag throughout the night. Wasted data. : (
H
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