This is my 1st RGB+Ha frames integration. More work required in alignment. I've learned a lot from members of this forums, and more comments and advices are welcome...


Equipment

Imaging telescope / lens Celestron Schmidt-Cassegrain (SCT) 8"/2032 mm 8SE
Imaging camera ZWO Optical ASI183mm Pro (CMOS)
Mount Equatorial Sky-Watcher HEQ5 Pro
Guiding telescope / lens Celestron Schmidt-Cassegrain (SCT) 8"/2032 mm 8SE
Guiding camera ZWO Optical ASI120MM Mini (mono) (CMOS)
Filters Baader Planetarium H-alpha (Narrowband Hydrogen Alpha) 35nm 1.25" 90%ZWO Optical Red 1.25" 90%ZWO Optical Green 1.25" 90%ZWO Optical Blue 1.25" 90%
Accessories Off-axis guider ZWO OpticalFocal reducer Celestron 0.63xFilter wheel ZWO Optical 1.25"Automatic focuser JMI MotoFocus+
Processed with Siril 0.99.6, GIMP (GNU Image Manipulation Program) 2.10.20 (revision 1)


Frames / Subs

Lights (filter Red) 45 x 60 sec
Lights (filter Green) 45 x 60 sec
Lights (filter Blue) 45 x 60 sec
Lights (filter H-alpha) 37 x 180 sec
Darks 50 x 60 sec
Darks 50 x 180 sec
Flats 50
Bias 60 x 0.001 sec
Total lights integration time 4:06 hours


Acquisition

Date Mon Nov 16th 2020
Seeing 3 / 5
Transparency 3 / 5
Sky Darkness #4 Rural/suburban transition - 6/9
Camera Sensor Temperature -10.0 ºC
Binning 2x2
Gain 111

Thanks for submitting it, your images are getting improved, but there is still room to improve.

The star do not look right in the image. It appears they have some coma? Maybe the scope requires collimation? maybe field not flat enough issue? I'm not really good at this but something is definitely off.

Thank you Jasem. I agree, there are a lot needed to be corrected. The stars looks bigger than I expect, and with close attention to the very small ones in the periphery, it looks like a trail in one direction. I'm setting major portion of today's session for alignment checking (PS: I don't have access to Polaris so I do polar alignment using other techniques). I checked the collimation yesterday and it looks ok.