In summary, I don't know...
I thought I read a comment somewhere, maybe Cloudy Nights, that made mention of speculation or TV comment (I don't recall) that the Ethos were not a scaled design...not sure what that means with respect to future sizes though nor can I add any verification or validity to the above comment as I don't know...
In my own opinion I am not sure of the overall utility in having a whole range of Ethoi (insert correct plural)...
No doubt they are incredible achievements and will drive our hobby forward and one day I have little doubt I will own them but I wonder at what point the specification will cut in to their overall usability and future sales.
Maybe they will allow us to get to that magic spot where only a high power, medium power and low power is needed...all ultra mega wide. What will I do with my eyepiece cases?!?!
Other than price, which may or may not be justified by some, assuming the other eyepiece characteristics are comparable (eye relief, sharpness, transmission et. al) why wouldn't they displace all other eypieces including TV's own ranges? I'm not sure if it makes good business sense to bring out a whole range...
I have no problem with owning premium glass (and paying the big dollars for it), I just have not felt the need to go that way and displace most of my eyepieces...but if I was just starting to put my eyepiece collection together I'd likely include them (13 and 8) in my set of tools...they could displace/replace several in my current tool kit.
I'm rambling now and straying from your original post (which I do not know the answer to) so I will wish you all clear skies...
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