One question that I would have is what are the magnifications the eyepieces would produce in your telescope? If the 8mm ethos would produce very high magnifications (>250x)it might be something that you can't use a lot unless seeing is exceptional. If it was to give you a more modest mag, I would go for an ethos over a radian any day. Even then, a cheap ethos would be pretty hard to go past....
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