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It also depends on what scope you are planning to use. Once you go full frame from APS then it requires larger focusers, correctors.
There are several good APS sized sensor cameras. For astro Canon as you say is the best supported.
7D2 is touted to be the best for astro but not sure you'd get one modded for under $1500.
If you check on ebay under full spectrum modified cameras there's a guy in Riverwood who is selling modded cameras. Canons, Nikon and Sony.
Greg.
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