I have viewed very well through some 7mm radians, Saturn was superb.
Never used zoom pieces, you would need to trial them, the focal lengths may vary from eps toeps.
I find 68 degree eps are good. I am using Orion Stratus in 24 and 17mm with good results.
Panoptics 24mm work very well, also have tried 13mm Naglers, Beautiful?
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