I have an old star tracker that I need to sell because I need to make space. I tested it out last night to make sure it still works, and now I don't want to sell it 
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@Elliptica Do you use a 6D?
@eee I mostly use a Sony A7III (and that is what I used for this image), though I normally use a dedicated astronomy camera for astrophotography now.
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@Elliptica I found out that the 6D has a full format sensor after I threw money at my 7D and a bunch of glass, and they're also cheap now
@eee It's a little more expensive than the 6D, but I think the Sony Alpha a7S is one of the best low light cameras you can get for the money today. They can be found on Ebay for around 400~600 dollars used with a very low shutter count because it's primarily a video camera.
The big advantage with them is that they have very big pixels. It's a 12MP camera, so it's "low resolution", but this is an advantage for astrophotography. The major one is that bigger pixels are more forgiving for less than perfect tracking (or even no tracking).
The other reason that they are good is that it's possible to remove the IR filter on these. I was told you can't do this with the a7sII and a7sIII, because they use some sort of IR light that interferes with the sensor. That said, I would recommend paying someone to do it for you, I tried it myself and messed something up which broke mine. Canon once sold the EOS Ra, which has that removed by default, but they are hard to find and way too expensive for what you get.
The big advantage with them is that they have very big pixels. It's a 12MP camera, so it's "low resolution", but this is an advantage for astrophotography. The major one is that bigger pixels are more forgiving for less than perfect tracking (or even no tracking).
The other reason that they are good is that it's possible to remove the IR filter on these. I was told you can't do this with the a7sII and a7sIII, because they use some sort of IR light that interferes with the sensor. That said, I would recommend paying someone to do it for you, I tried it myself and messed something up which broke mine. Canon once sold the EOS Ra, which has that removed by default, but they are hard to find and way too expensive for what you get.
@Elliptica getting to the sensor isn't too difficult i'd argue