I love my Star Adventurer. It's a surprisingly capable device for its diminutive size. I've been using it for about a year, and have done well with focal lengths up to 135mm. Once I became confident with polar alignment at least, which can be challenging.
One night I decided to give it a try, just for the hell of it, with my Sigma 50-500mm lens. That lens, with my 5D3 is pretty heavy, though within the load limit advertised. I never though I'd be able to get good enough tracking at 500mm, but I was completely surprised! I had to throw out half my subs, but with the rest I was able to get the attached photo, much to my delight!
Canon 5D3
Sigma 50-500mm @500mm
15x2min f6.3 ISO3200
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