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Another thing to think about janos is, if you're using a dob (well any scope really but *particularly* a push/pull alt/az type mount), mirror flip will bugger up your shots for anything slower than about 1/60 sec so you will be pretty restricted with what you shoot. If you can post your telescope details, particularly f ratio I can find you the exposure ratings for the most likely objects you will try to shoot for. As Ice says if you're going for planetary shots, think webcam.
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