Here is my 1st M33. It was shot with my ASI183mm-Pro and ZWO 36mm Premium LRGB filters and Baader 7nm Ha, using my Esprit 100 with the TSAPORED075 FF/FR at 413mm. I have not been able to get the background right, even with multiple DBE, ABE, PCC, etc.... The background has large blotches of red. My only (inexperienced) guess is that I need more integration time, especially for Ha. This is a HaRGB image, with Lum extracted by PI. Extracted Lum was MUCH better than using my Lum data, with more detail; with the Lum data I got a bright haze around the core.
Ha 240sec x 42
R 120sec x 105
G 120sec x 74
B 120sec x 98
For this I stretched using MS. The star color is not as good as AS, but AS was blowing out the Red Ha knots. Using normal HT, the background was even more of a mess, and I had worse detail. HDRXform and MLT Sharpening helped, but Dark Structure Enhance did not; the opposite of my M31.
This is my 1st image that I semi-finished with Esprit 100 and the TSAPORED075 FF/FR, and this only has minor crops for stacking artifacts. My opinion is that the TSAPORED075 FF/FR works well for the Esprit 100, and I very much like the 413mm framing with the ASI183 as well as the f/4.13 speed.
Any other suggestions on the background blotchiness?