Here is my 1st attempt at LRGB Horsehead and Flame Nebulas, B33 and NGC 2024, from my suburban Louisville, KY backyard. It was shot with my ASI183mm-Pro and ZWO 36mm Premium RGB filters, using my Esprit 100 with the TSAPORED075 FF/FR at 413mm, f/4.13. Processed with PixInsight.
Lum 30sec x 226
R 60sec x 95
G 60sec x 95
B 60sec x 96
I got 3 straight clear/dark nights, Thu-Sat, after almost no good skies for a couple of months. It is a little late in the season for these targets, as I had only about 40min pre-meridian, after sunset, and 2 hours post-meridian, before target rotated into my house's roof. I would have liked another night to get some Ha, but weather is going to get bad starting tonight.
I notice that my bottom left corner is dark purple; is that correct?
Also, Alnitak is a nasty bright beast. I tried to mask my AS stretch, but I got rings, so I did AS straight up (several passes) followed by MS and HT. Is there a good post-processing strategy for Alnitak?