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The night I took the image of M42 down at my dark site the ambient temperature outside was 18 deg quite cool , plus seeing conditions were very good that’s how I was able to shoot at ISO 1600
I imaged the Rosette Nebula last week at ISO 800 with 50 x 3 minute subs and my sensor temperature was 35 deg ( outside air was 22 deg ) so plenty of read noise etc
My 600D has a sweet spot at ISO800 according to Jerry Lodriguss at astropix
I wouldn’t bother with trying to cool your DSLR as they were never designed to be cooled , in fact they were never designed for astrophotography
Just be patient and wait for cooler nights when it’s clear
As you can see DSLR’s do a great job when conditions are good and your imaging rig is set up right
Startools is a great program for beginners like me ( no histogram or curve settings to tweak ) and it won’t let you clip your data either
Use the free trial and see if you like it
It has a lot of features
Cheers
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