Hi there,
I have a problem that might not be to others but I van not solve it. I started doing some planetary images with SW Mak 180 Pro and using ASI 120 MC-S camera from ZWO. I made a simple train , i.e 1,25" to 2" reducer, and extention 1,25" delivered with camera giving together 42,5 mm (from the last machined part of the telescope i.e from the Cryford focuser that I added to my Mak). Together with camera back focus of 12,5 mm it is exactly 55 mm. It is working relatively fine so far. I have also tried to put the same train (for moon imagining) on the SW Evostar 72 /420 mm refractor, (as on the picture) but there is no way I could even come close to some focus. Just for info, I have bought thet Evostar for DS ( to work with my canon and ASI 120 MC-S as guder) when my T ring and flttener will arrive. I do not ubnderstand that for testing I could not reach focus with evostar. It has its own great focus as well as camera when used with its wide angle lens.
Thank you in advance