I asked in the astrophotography forum, but I guess nobody there uses this camera for that purpose. I have a T3i. I shoot wildlife/birds, landscapes and astro, all equally the same so I can't say which one I shoot the most. The T3i doesn't do birds in flight well, and doesn't handle high ISO well, so I'm upgrading to either a 6D or a7D mkII. Both are on sale in a bundle for the same price this week but I can't make up my mind which one to get. Ideally I'd get a 6D for the astro and a 7D mkII for wildlife/birds, but I can't afford both.
Does anyone know how the 7D mkII handles high ISO, like I would need for the night sky? I would be shooting at 3200-6400 ISO or maybe higher.