Just to add my thoughts, Im no expert and have both an ASI 1600 mm and an ASI 2600mc. I loved my ASI1600 and the mono images it produced but I always felt I need to give a subject a lot of time to get a good image using narrow band filters. Also I was never happy with the results I got with RGB filters so I got a ASI2600 mc, I also got an optolong Enhance filter with the camera and after trying found I could get an image that I was pleased with in a lot less time. Was it as good as the ASI 1600 with a long exposure time? No but I was getting to see more targets and enjoying the images Im getting. I have since purchased an Optolong Extreme filter which I feel is giving better still results, not in the ASI 1600 narrow band filter results class but just good enough to make me happy. Im not getting rid of the ASI 1600 just yet as there are a few targets out there that i think it will really excel with but for just shear pleasure of seeing an image in a shorter time as possible I dont think you can beat the ASI 2600 mc at the moment.