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Hmmm, thanks Alex, that pretty much confirmed my theory then, it was the image rotation that I was missing, I thought the similar "tilt" mode of the Alt/Az mounts might be able to be reproduced with the DOB to allow longer tracking only on the AZ axis, but it seems its a bit of a pipe dream.
I wasnt trying to replace the idea of an EQ5-EQ6 mount (by the way Andrews now has the EQ6 for $1499) with a DOB tube on board, but thought if I ever buy a dob, and get the "you know whats" with having to nudge it constantly, that maybe there is a fudged method of getting more viewing time when visually tracking something.
Thanks for the replies everyone.
Chris
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