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Jose, the 4 Jupiter moons are fantastic.
Not sure about the belt, maybe try exposing a bit less? Have you tried working with highlights/exposure in post processing. This is way beyond the limits of anything I have gotten to. With a Celestron reflector telescope a few years back, I could just barely (wasn't 100% sure) see the belt. I have to go back and check since its gathering dust in the garage, but I think it was 1200mm or so of focal length. I did see the Saturn rings fairly clearly once with that telescope.
Samy, I even tried hard Jupiter with the same setup of the moon above, but never managed to get a good picture/exposure showing the belt
This is a huge crop ~50-60%. ISO 1600, f/11 at 1/5s.