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Thanks Ryan, and I agree, going to take some trial and error. Was thinking about the Starizona Nexus reducer that i used (not an MPCC), its a little on the stubby side compared to a Paracorr Type 2, with the Skywatcher F4 coma corrector being the longest of the three. Ill try with the Skywatcher cc and see how that goes, as you, Stefan, Martin are right, all that weight (ASI2600, OAG-L, 7x2" EFW all hanging on the collar of a stubby Starizona Nexus might cause issues, including tilt, and possibly pinching. It could be that weight, could be the 2 thumbscrews ive tightened around the collar (but probably less likely), or could also be a pinched optic within the Starizona Nexus itself. Given the weight though, and the basic focuser that it is on the Quattro 10, i could def see how that might be the weakest link.
Looking up focusers now.
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