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Thanks David thank Al ... yes I have always been conscious of the diam of the top of the pier as regards clearance especially with camera attached ... I have a Titan I bought 2 years ago to go on it with a MAL adapter that is 180mm in diameter ... So based on those calculations Al a concete pier of 197mm would be adequate. (for 1800mm) ... Im thinking if I do it 250mm and have a small reduction at the top ( say over the last 30mm or so) down to 180mm for the Titan adapter then this might just do it.
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