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G'day
I have a series 5000 80mm apo on mine which does a great job for wide field and the mount does not feel it at all (I also use 2D weight system). I would imagine a 100mm would be ok but the 127mm would probably cause some problems as you would have to add extra weights to get the balance right. It could also be fun if the scope was long as you would have bits poking out all over the place. The 80 is about the same length as the tube with the focuser wound right in but is about 4 inches longer when wound right out which happens to be the sweet spot for most camera's I have attached at prime focus.
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