Have a look at Roger Clark's review of the Canon 7D mark 11 ( clarkvision.com )
One of the best Canon APC-C DSLR's for Astrophotography
Low dark current, good Ha response, high sensitivity
Only drawback is its quite heavy at 910grams and they are not cheap at around $2000 new
When my 9 year old 600D finally gives up, the 7D mark 11 will be my next camera
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