According to Roger Clark in the US from clarkvision.com the Canon 7D mark 11 is the best DSLR for astrophotography as it has low noise and good hydrogen alpha response ( for both standalone on tripod or through a telescope at prime focus )
The only drawback it weighs 950grams very heavy
My current 10 year old Canon 600D only weighs 590 grams
Hope this helps
Cheers
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