In my opinion, the most suitable one for beginners is the 150mm Newtonian. Like skywatcher 15075EQ3. A 6-inch F5 Newtonian is suitable for both visual and astrophotography. You can upgrade it according to your needs later. You can change the focuser, spider supports, and get a better equatorial mount (such as NEQ6 GEM45) and a coma corrector to get excellent images
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