[Leo.G (Leo)]

These images were shot with my 8" RC focuser screwed on my old Megrez since it's focuser had slop. I've since replaced the bearings now and it's fine but the GSO linear track focuser is better with my heavy Nikon D810 DSLR.
A decent night with no cloud just set up on a Manfrotto tripod.
The whole point was finding back focus distances with this focuser (and extension rings, they screw straight on the old Megrez). A bad migraine meant focus was never going to be absolute, bad sight tonight but clear skies.

The first image was taken through a 5 times Powermate with my Nikon D810. My powermate doesn't maintain a correct centre in my home design adapter but I'll machine it and put a compression band in, that's only minutes on the lathe. Pulling off centre just slightly introduces a green CA hue on the lower edge, without the PM I get no visible CA through the Megrez (semi APO). The second image straight through the camera, cropped heavily though.
Focus could have been better but the Manfrotto shook too much while I was trying to dial it in and I haven't finished my shaped alloy block to attach a remote unit to the focuser (I have but can't remember where I put it).
Far from my best shots but more experimental and not too bad considering, single images and old Megrez, minimal processing on exposure and blacks and shadows in Lightroom.