I’ve captured NGC 5139 Omega Centauri “the big daddy” of globular clusters many times before over the years with my old DSLR and more recently OSC 2600MC, However this is the first time using my 2600MM in LRGB
As my skies are B8 with a 30% waxing moon descending in the north and north west , I decided to stick to 30 sec subs on low gain as Luminance goes off the richter scale with this camera under heavy sky glow.
Quite pleased how this image turned out with respect to contrast and control of brightness across the huge main core region.
I tried not to oversaturate the colour too much to avoid the stars looking like M&M’s
30% Waxing Moon
B8 City suburban Skies
Seeing average to poor ( early heavy dew set in )
8” f5 Klaus Helmerich carbon fibre Newtonian
Skywatcher EQ6-R pro mount
ZWO 2600MM cooled to -10C , Gain 0
Antlia LRGB filters
Integration approx 2 hours
Lum 75 x 30 sec
Red 50 x 30 sec
Green 50 x 30 sec
Blue 55 x 30 sec
Dithered every 3rd sub
Bias from Library
Darks from Library
Flats for LRGB
Tracking and Goto EQMOD and Stellarium
Aquisition APT
PHD2 Multistar guiding ( 0.48 to 0.55 arc sec total )
Data Analysed , Calibrated, Stacked and Aligned in ASTAP
Post processed in Startools V1.8 via Compose L + Synthetic L , RGB
Astrobin link below for full resolution….
https://www.astrobin.com/fotczm/
Attached Native frame size 200KB
Crop version 200KB
Comments Welcome
Thanks for looking
Martin