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Glenn,
Great effort there for taking on a dim difficult target with a DSLR
Well done !!
Noise ( banding ) is quite high due to your DSLR’s sensor temp ( probably up around 25 + degrees )
At some stage in the future I’d recommend you go next step to cooled OSC
I used my Canon 600D for 4 or 5 years and struggled with noisy low res images ( imaged NGC 6744 too with my DSLR ) I now have a 2600MC and virtually noise free on any length sub on any target and so much more fine detail ( chalk and cheese ) Expensive yes , but worth every cent .....
Canon DSLR QE around 35 to 40 %!
ZWO 2600MC QE +80%
Cheers
Martin
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