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I’ve been successfully imaging galaxies under Bortle 8 in Sydney using a Canon 600D DSLR until 2019 and in the last 2 years with my ZWO 2600MC OSC
Both cameras have a UV / IR cut filter ( I used no other filter )
I only imaged galaxies during the “new moon period” and used lucky imaging techniques ( refer Cuiv the lazy geek )
Subs with the DSLR were 60 sec , dithered, with darks ( minimum 3 hours of data ) Point of diminishing return was around 3 to 4 hours
Subs with the OSC were 60 to 90 sec , dithered with Flats and Bias ( minimum 4 to 5 hours of data ) subs file sizes on the 2600MC are 50MB so massive storage required
DSLR galaxy images obviously had a much higher noise floor and less detail than the 2600MC
No issues with colour during processing
Stacking software DSS
Processing software Startools
Cheers
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