[NikolaNovak]

I'm assuming that'd be a non-moving/automated tripod?

I have a d850 full-frame DSLR and either a 200mm 2.8 or 500mm 5.6, with some decent tripods; but earth's rotation tends to get me pretty quickly with any long-exposure photos :(

[cconstantine]

I've seen some pretty impressive stuff done with a relatively cheap / simple DSLR setup.

The basics of astrophotography aren't that expensive, but it gets exponentially more expensive to meaningfully "zoom in". Because DSLRs with typical lenses are pretty zoomed out you can get away with much cheaper gear. You might look into getting a "star tracker". It's like a telescope mount for a camera; it'll keep the still relative to the stars but because they don't need to be as accurate they're far cheaper to make. They'll probably work just fine for your 200mm 2.8 lens for a fraction of the cost of a mount.

[alistairSH]

I think it's rotating, but doesn't have a secondary camera as described above. Maybe he spent more than $500, but I tend to doubt it, but I'm also not sure of the specifics beyond he's using a crop-frame Nikon DSLR with a lens he already had for birding (I think).