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thanks for responding Glen & Paul
Aperture: 305mm
F/L 1500mm
Primary mirror has been re coated.
Sec. mirror is new.
I am starting to think:
1: There is too much play in the focuser.
2: There is too much flex in the truss/ tube.
3: The whole rig is just not suited to high accuracy astro photography.
In essence, trying to push 'ship' uphill...
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