FredNurk

150 has a 47mm secondary and my N10 has 55mm and the 300 skywatcher has 70mm . I have minimal fall off on the N10 . From memory the diagonal on the APS-c is about 27mm... I wonder if flats alone could remedy any resulting vignetting. Ross

I am using the Altair 26c and the Touptek mono 571 cameras with 10 inch f5 celestron newtonian and a non Quatro f5 12 inch Skywatcher Newtonian. Both have a generic coma corrector from FLO and the results are very promising and a quantum leap from the zwo 294. Lots of dynamic range, no amp glow and super easy to process. I will be buying the new Starizona corrector for both fairly soon... ouch. The bigger issue for both scopes was that the flop in the original focusers caused tilt issues that were uncorrectable. I moved to a baader steel trak and the problem disappeared.