ah, you're right. Hadn't given that much thought at all.
Distance between my pupils is exactly 7cm.
That's not going to work with 2 70mm scopes side by side. Not without special diagonals, that is.
60mm have a better chance to work, straight out of the box.
Pity. 60mm is not much more light than my 7x50 binos.
But your comment got me googling again (my primary hobby is googling)
and I found good stuff on cloudynights.
Asymmetric tube construction
And a
thread that is exactly about my 70mm idea.
Very good.
I knew there'd be something I'd have to consider before purchasing anything.
I'm just not that smart as I would like to think
And I think you pushed me in the right direction. Cheers.