I've not had extensive experience with them but I would say no. They are not designed to be used with a long focal length SCT and it shows from what I've seen. The first time I looked through an ethos it was in a 8" SCT and it seemed pretty ho-hum. But put it in my short focal length dob and WOW! You're probably better off looking at the Radians or Plossls (gotta admit those TV plossls are sharp in constrast).
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