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I've been wondering the same thing myself. There's two challenges, one is to be able to resolve drift into RA and dec vectors. The other is apply a sufficiently small adjustment.
I use a geared head and the vixen polar scope, but hang the camera off the front of the polarie during the process via its strap, as there is a surprising amount of flex in the RA drive.
I'm getting good 120s subs at 180mm focal length, I might try longer and see how good it is.
Cheers,
Andrew.
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