John
I am basing my comments on my experience. I had no significant issues using my 13mm T6 Nag with glasses, it was close but with a bit of practice doable. In the 12" I also tested if the image improved with glasses removed and it was very minor improvement so I usually observed with glasses on.
Since upgrading to the 20" f5, I am using Ethoi just about exclusively, though I did paly with some Naglers. I have fond no significant difficulty using the Ethoi with glasses on. Of interest is that the image is significantly better now without glasses, so that is the way I tend to observe now.
With regard to seeing the full FOV, I find I have to move my head regardless of whether I have glasses on or not to see the edge, but as a rule I am not really interested in the edge, only in the quality of the image near the centre, and the Ethoi win hands down against other EPs I have tried.
Maybe I am the 1 in 50 but I can only relate my experience. I guess that observing is often a personal experience and what one person finds comfortable may not work for someone else.
Malcolm
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