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If your in suburban Sydney ( bortle 7 to 8 sky ) and using a DSLR ( which I do Canon 600D) I find capturing lots of short exposures without the filter gives you a better outcome when stacking and post processing
Try 40 to 60 subs @ 25 to 40 sec with ISO 800, you still capture enough data
I’ve tried 5 minute, 3 minute , 2 minute and 1 minute subs at ISO 400 / 800 and the end result is to much noise and a massive blown out core which you can’t clean up
Your DSLR sensor temperature with long subs is probably around 39 to 45 degrees but at short subs with pause and delay it should be sitting around 32 to 35 degrees, this does help
With shorter subs you can try layering in your post processing as well ( I’m still learning this feature )
Hopefully tonight I’m going for 60 x 30 sec subs and 15 darks at ISO800
Good luck !
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