Roughly 4.5 hours in broadband (BB) and 2 hours in Ha (Seestar S50 LP filter) from a bortle 5 location. I was lucky to have three nights in a row with very good seeing – the Ha signal is quite subtle around the core but I like it this way!
Equipment and acquisition:
– Seestar S50, 30 sec subs, EQ mode
– Ha signal extracted from LP filter stack
Processing (PI and Siril)
– WBPP, 2x drizzle for both BB and LP
– SetiAstro DBE, blurX
– LP stack: extracted R channel (Ha), SetiAstro continuum subtraction and GHS, noise X
– BB stack: noise X, SetiAstro statistical stretch, then manual curves transformation
– Added LP R channel to BB stack using Pixelmath using Benjamin DeHaven method
– On the new stack, starX
– Starless image: several manual curves transformation steps with range and color masks
– Stars: SetiAstro star stretch
– Star recomposition in Siril
– Final color retouches in LightRoom
by Techno-Scientist