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Mark,
Good effort there on a difficult target
Obviously seeing wasn’t the best as your focus looks ok but stars seem a tad bloated
Under darker skies with my 600D I used 3 minute subs at ISO800 on most objects to keep the noise floor down a bit. If seeing was really good I’d take a chance and push 5 minute subs. In Sydney under Bortle 8 my 600D wa limited to 90 sec subs no matter what object ( if the moon was full , forget it ) I think from memory the 700D at ISO800 to 1600 is the sweet spot for DR , mine was ISO800.
The cold air will assist some dark current with your DSLR but the sensor electronics need to get down to at least -5C internally to gain any real benefit
It might be 0C outside but pushing 5 min subs will still result in an internal sensor temp of around 15 to 18C.
That’s why the QE on most DSLR’s is only 30 to 40% whereas dedicated cooled Astro cameras are typically 80 to 90% QE
I used a 600D for a number of years and made my own cooler etc.. sensor probe never got below 18C during cold winter nights around 5C.
If you eventually buy a licence for Startools , I’m happy to offer some processing assistance if your interested
I’ve been using it for 5 years, currently using V1.7 ( V1.8 is the latest )
Cheers
Martin
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