My TOA130F weighs a tad more than the 2.7" focuser I previously had. That was 10kg bare bones. I know it is a heavy bugger to lug around. The 4" focuser definitely adds more weight. They are also very nose heavy due to the monster slabs of glass at the front. There is no tube counteweight on the 130F either, obviously because of the added weight of the larger focuser. I know I queried this when I received it and that was Tak's response.
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