I appreciate the advice guys, but like I said, I have a while to wait for my OTA. I'll look at more reliable sources for canon 6d's, and I am also looking at used Nikon d600's or other full frame cameras with good low light ISO.
What makes you think you need a full frame sensor anyway? The vast majority of astro images are shot with APS-C and even smaller sensors. You don't need a large sensor to mitigate noise, you need time. You need lots of subs, especially if you're shooting in a high Bortle location. Below is only 3 hour's worth of the Cygnus Loop shot in Bortle 9 with a full frame D600 on an AT60ED. Not too impressive, right? But hey, it's a full frame sensor, no? It looks like crap because I didn't shoot enough time, and then I proceeded to pull hens teeth LOL. I would've needed about 10-15 hour's worth of time (in Bortle 9) to get this right. This was a project I had started but unfortunately could not finish at the time, I'll try it again next fall.
So really, don't get too hung up on having a full frame sensor to shoot astro. An APS-C based camera will allow you access to more scopes that will vignette significantly on a full frame sensor as well. But you already have the 6D, you could just roll with it when you get your scope.
Edited by vidrazor, 14 May 2022 - 10:32 AM.