[Startrek (Martin)]

It’s taken me nearly 4 years to realise the Baader MPCC coma corrector has its limitations. I was never totally happy with Star shape in the corners of my field and over the past month or so tried to fiddle around with 0.2mm to 0.5mm spacers to try and resolve it ( never did )
The guys at Sidereal put me on to the TS Optics GPU 4 element 1.0x coma corrector which is ideal for f4 but also works well at f5 and f6 systems which I use.
Did some star testing on Monday night my new 10” f5 Carbon fibre Newt and found nice tight round Stars to edge of frame with 60 sec unguided subs. Quite pleasing
Also did some testing last night with my little 6” f6 GSO Newt and imaged M104 Sombrero Galaxy for a while with the new TS GPU coma corrector. Again really happy with Star shape across the whole field to the edges
The Baader MPCC Mk3 has been a workhorse for a long time but will now be retired

92% waning moon over head
Bortle 7/8
6” f6 Bintel GSO newt
EQ6-R pro mount
ZWOASI2600MC cooled to -10C , Ascom Gain 100 LRN
No filters , just internal UV/ IR cut
TS Optics GPU 4 element 1.0x coma corrector
62 x 90 sec dithered guided subs
40 x Flats
40 x Bias
PHD2 Multistar guiding (conditions deteriorated into the night 0.65 to 0.85 arc sec error total)
EQMOD,Stellarium, APT
Stacked in DSS
Processed in Startools V1.7 OSC linear data set
Obviously loads of noise gradient mainly due to moon glare and LP , tried to mitigate it as much as possible
Limited data on a dim object doesn’t help either. For a OSC and relatively short focal length under those conditions you really need 3 or 4 hours on a target like this , however my main objective was to test the coma corrector

Original frame
Crop version

Comments welcome
Thanks