Those finders sound heavy. I usually just use a reflex, or sometimes a straight-through on my 127mm Mak and 150mm Newtonian. The zenith, or near it, can be a bit of a challenge though. Two inch widefield low power eyepieces can be a solution, or possibly a zoom. This is the ST102 with both finders and the Baader Hyperion zoom. The AZ5 seems to handle it all and I'm getting some dexterity back into my right arm and hand, so when the sky soup finally clears I may get to use it on the zenith. I may have to wait about a fortnight, but the BBC Weather app said it's definitely going to get better. I don't believe them ... Happy Beltane!