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Hi, Brendon.
I certainly agree with what your sayng about measurement, and most of this has been done. The problem with this design is that there is a whole new level of complication with a rotaing head on a truss mount.
I know with Ian Bedfords 30" telscope, (which I based my design on). He spent an extrodinary amount of time with the same problems and his engineering is perfect.
I also agree that the scattered light will not give pefect alignment, but it will make it easier to see where the adjustments are required.
Cheers,
Justin.
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