After a wait for an adapter I now have a TOA Flattener on the RC8. I had the scope on the bench to try and nail collimation then was using NGC5139 for testing the other night, full moon and all.
The flattener has made quiet a difference but the collimation is still a squeak out.
Given there were clear skies for once, despite a full moon I couldn't resist another go at this beautiful cluster.
2.5ish hours of RGB with the RC8 and STL6303e setup.
Large Here
NGC5139 test
Thanks for looking