Have you considered a Sidereal Trading 10” f5 carbon fibre newt
Huge aperture, long focal length at 1250mm , easy to collimate and light enough on your big AZ Alt mount
A real galaxy hunter down there
Only one caveat, on a windy night , guiding will be affected but I use poly tarps from Bunnings and hook them up on some small trees around my 8” f5 when I’m at Narrawallee and it’s windy and have managed to guide under 1 arc sec in 25 km/hr whilst imaging galaxies
Attached image of Pavo Galaxy on a windy night at Narrawallee with my 8” f5 newt
Just a thought !
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