Taken from Bromley ( Bortle 7 or 8 ) on 22nd November 2021
Sharpstar 15028HNT
ASI1600MM Pro (Temp -15, Gain 139)
iOptron CEM25P mount.
ASIAir Pro (Imaging, guiding, focus and filter control)
Ha: 54 x 120sec
B: 53 x 24sec
G: 29 x 30sec
R: 26 x 48sec
Process: Pixinsight and Photoshop
Moon: 63% (seperation 49 degrees)
Excuses: Cloud was increasing during imaging. By the time I was imaging with in Red cloud was thick enough to stop the guiding.
I have removed the dew heater from the secondary mirror but there are still some odd stars.
I suspect that the sensor is not perpendicular. Some subs were taken pre Meridian Flip, they do not precisely mirror the post Meridian Flip subs. This is a (stretched) master Flat:
The vignetting is not symmetrical and I would presume that it should be. There are push me/pull you screws at the base of the focuser and so I am thinking of seeing if I can get the circle centred. Then I can attack collimation (bearing in mind this is an f2.8 telescope and is fussy).
Regards,
John
ps: Unfortunately, my family has to self-isolate this week and so I will have to attend tonight's talk via Zoom. I was looking forward to being there.
Nice Image.
Mac