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I've found the Z61 an excellent all-round scope. But it definitely needs the flattener - without it, focus drops off halfway to the edge. It's got a bit of heft to it. One thing that bugs me is that the focus knobs don't quite clear the dovetail bracket which means if I want to have the focus knobs horizontal to the ground, I have to loosen the clamp screw, pop the scope out, turn, then put it back in the clamp and tighten, which I have to do whenever I take it in and out of it's bag. A very minor annoyance but the designers just needed to make the dovetail 2 mm taller. Apart from that, quality is excellent, focusser is smooth with 70mm of travel and star images seem pretty good for a doublet - certainly better than my 72/80mm skywatchers - see attached. It's a non rotating focusser, but the flattener has the ability to turn so it fixes that minor problem.
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