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I'm basically taking the measurements off the ota as it stands at the moment with regard to secondary and focuser position. Just locating the central frame based on balance. Just doing calculations I dont think I can easily truss convert my 5" with where the balance point is already. It's focuser/camera end heavy to the point where the front ring is hard up against the back of the focuser.. I really need to make the rear end heavier to better the system and by measurements I've made the rear will shed weight and the front end won't really at all. That's a bit of a shame as I would have liked to have done a test of concept on the 5" before doing the 8"
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