My current camera setup is fairly simple: I use a Canon R10 body and rotate between three different lenses — the Canon RF 100–400mm, the Canon RF 35mm Macro, and the Sigma Contemporary 10–18mm for the RF mount as well. The crop sensor on the R10 increases those effective focal lengths by 1.6x bringing the 400mm high end to a 640mm full frame equivalent. When it comes to filters, the only one I use is a CPL filter from Hoya for some landscape shots to help with the contrast or for controlling reflections.
The star mount I use is the Sky-Watcher Star Adventurer GTI on the tripod that comes with the mount. I'm very new to it, but have already had luck with 90 second exposures without any star trailing.