If it has to be Canon, then I'd agree that the 6D would be the best choice and only slightly bested by the considerably more expensive 5D mkIV: however; if you open the field to other contenders I would suggest Nikon D600, 610,800,810, Sony A7r3 or in APSC , Fuji has some models with very good hydrogen alpha response (around 43% transmission !!!! compared with most other brands in the 20 to 25% range. That's a huge difference) the only downside with the earlier Fuji cameras like the Pro 1 & the X-e1 is their lack of tethering ability; however as a standalone in the field it could be OK
Best
JA
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