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While I do not have an over abundance of experience with binoviewing, I am quite fond of my Denkmier 14 mm and 21 mm. I have used them in my 8 inch dob and also in my ED80 to good effect.
They have ample eye relief and 68 degree FOV...there are nice eyepieces and I would highly recommend them (depending on your budget). I consider them to be in the same league as the other "premium" eyepieces I own (compared mono mode only) and I do own and use some Naglers (13 T6 and 16 T5) and Pentax XW (7 and 10 mm) along with an assortment of TV Plossls. I think they are that good.
I have also used TV plossls in my Denkmier Binoviewer which also work well until the eye relief gets a little tight in the shorter focal lengths. When I am going for max magnification I move to my 8 mm TMB Planetary eyepieces...while not as nice as the Denks in terms of overall build quality (my opinion), they are good value for money...no they are not Naglers but they are not priced like Naglers either.
Good Luck!
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