I am at present imaging with a SW 120ED telescope and wanted to gain more photons more quickly . I have a C9.25" with a meade F6.3 focal reducer and did the calculations on image scale and brightness for both scopes . I found, correcct me if im wrong , them to be Similar for both scopes . The only advantage of the c9.25" being increased resolution. I then looked at the possibility of a small fast imaging newtonian like those offered by GSO and Skywatcher. However with my present setup I use an Orion DL off axis guider with no back focus problems , would I still be able to use one of these with a coma corrector on a photographic optimized Newtonian? I suspect an 8" Schmidt Newtonian OT would better fit the bill , but i dont think they make them anymore.
Regards philip
