Rod,

Last year during the TSP I did a A-B comparison of the 13 Ethos and the then new prototype 14 Delos in my 48" F/4. Uncle Al was with me at my observatory at the time of the comparison. What I found out and it was confirmed by several other observers was that you could see fainter stars with the 14 Delos than you could see with the 13 Ethos. From my experience the Delos has better light transmission. But there nothing like the 100 degree field of view of the Ethos. I guess there is no perfect eyepiece for every view. Thats why uncle Al has so much of my money