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Hi David
Beware of received wisdom of nay sayer's from this site , how many of these people have actually tried using a scope on top of a water tank ?
I use many different scopes for visual and imaging on top of a concrete water tank ( set into the ground ) just as they say you shouldn't , for visual and imaging .
My scopes are sitting on timber piers ( just as you some say you shouldn't ) which have loose gravel in the bottom half so they don't blow away work better than any tripod is cheaper ( and better ) than a metal pier and no vibration not even when the water pump runs.
My suggestion is to do a temperary pier try it for your self and then go ahead with the observatory.
All the best
Zane
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