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Mark,
Nice image of the Helix
Well done !
Your using exactly the same software as I’ve used for a long time, although for 16 months I’ve been using a ZWO 2600MC cooled OSC ( I used my Canon 600D for +3 years )
In regard to DSLR’s and subs longer than 60 sec , my advice is take your darks ( say 20 ) to reduce thermal noise and dither your subs to reduce fixed pattern noise and dark current
Astrophotography tool has the dither function located under the Guide tab , just enable it to on , dither every frame and use dither distance 1 or 2 depending on how long your mount recovers from a dither.
This will definitely improve your images noise floor which is evident in your image
My Canon 600D use to run at 21C in winter and up to 35C in summer , a recipe for lots of noise , so I took darks and dithered to reduce this which did work well.
Other than the above, to reduce noise further , take shorter subs ( say 60sec to 120 sec ) but hundreds and hundreds of them
Cheers
Martin
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