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Just a couple notes:
1) many people find the TeleVue Delites too large for binoviewing and they are only 48.5mm in diameter. So more is involved than the outside diameter of the eyepiece.
2) after years of looking into eyepieces perpendicular to my face (in a dob), when I use a binoviewer, I raise the seat until I am looking into the eyepieces perpendicular to my face. As a result, the bridge of my nose never comes close to the eyepieces, any more than it does when I use the eyepiece as a single. To me it's like using binoculars.
I notice, on the other hand, that many observers sit very low and look into the binoviewers as if looking into a microscope, looking down at an angle.
That means the nose is close to, or even between, the eyepieces instead of well back from them.
If that's the case, lowering or removing the eyecups might make a lot of difference for clearance. And raising your seat so you look through the binoviewers at a different angle can also help.
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