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Peter, you are absolutely correct about this being a mature market. I've got a Nagler (Type 4) 17mm eyepiece, a pair of Denkmeier 21mm oculars and some Pentax glass in addition to my Radians. Other options include the Nikon NAV SW series, the Vixen LV and LVW oculars (along with the Hyperion and Stratus knock-offs of the latter), the Long Perng `Long Eye Relief' eyepieces and no doubt others that I am forgetting. Then you could add the idea of using a long focal length plossl with a barlow lens (I did this for years and it works well until you become besotted by eyepiece designs offering a larger AFOV). The Ethos doesn't really work for me, 15mm of eye relief is not quite enough. For the same reason I cull the TMB Planetary series which never supplied the amount of eye relief Tom originally suggested (he claimed them to be Radian like before they shipped).
I guess if you cannot create a new market (like the Ethos did) then the next best thing is to introduce a winning product into a mature market. We shall see how well Tele Vue has managed this idea when we get to use the new eyepieces. Like Ken and others have said, I am sure that the green lettering will not hurt sales. "EPS are a pretty personal choice" is perhaps the best short summation of all.
Clear skies!
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