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I had an Ethos 13mm. Views though a TEC180 were great. I have had several Naglers and Panoptics, Radians.
Definitely a top eyepiece but very large, heavy and expensive.
I don't think it would suit a small refractor as 13mm is a bit too wide for say 630mm focal length but good at 1260mm.
So make sure you are willing to handle the size and weight. The Lunt/APM eyepeices appear to also be large and heavy but not expensive.
Greg.
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