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Hi John,
One further aspect of the observing experience I think is worth conveying is the flatness of the (apparent) field. I was never really conscious of this parameter until I started observing with a large binocular Newtonian.
Nagler type 4's are still to this day one of the best designs for use in binocular Newtonians, but... the positive field curvature is unmistakable.
The nav in comparison seem to project a star scape that is more natural in as much as it seems to be flat and at a distance of infinity. Also, the field stop simply disappears... or at least fades from being a significant detail.
This all adds up to the perception of standing at the edge of the abyss (as distinct from looking at a picture on your monitor)
I'm guessing that if there is a possibility of an incremental step closer to eyepiece perfection above the Nikon NAV17 HW, it will either be a subtle refinement of the art of opto-mechanics or a wholesale change in the way we access our senses... ie) fire wire port in the back of our heads.
In the mean time, I will just order another NAV.
caveat:
I have not compared the NAV side by side with a docter or ethos....
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