I've done this but for observing the sun with a DSLR/telephoto for long periods. I've seen several projects to do this, a related project is https://opensamoff

I've done this but for observing the sun with a DSLR/telephoto for long periods. I've seen several projects to do this, a related project is https://opensamofficial.github.io/OpenSAM/ https://opensamofficial.github.io/OpenSAM/ but that's more of a stabilizer. When I built my own I hit a number of challenges: the 3d printed plastic parts melted in the sun (switched from PLA to PETG, printed in pure white). DSLRs with telephotos are heavy so I ended up using gearing. I should have put more time into balancing the camera to reduce the motor demands. I don't think a DSLR is ideal- I'd much rather use a small, cheap industrial camera, but I've never found the equivalent of an affordable 300mm telephoto that is C-mount and goes on industrial camera. I used stepper motors, not BLDC, without feedback (other than a zero-position limit switch) and a simple realtime algorithm for pointing; it worked, but wasn't really good enough to make the sunspot timelapses I wanted. I think for this it makes more sense to buy a quality telescope motorized mount, a nice refractor telescope, and then put a DSLR at prime focus. It'd be about $3K but would save a lot of time compared to DIY.