Hi Nick, sounds like the added distance of the binoviewer puts it outside the focal point of the scope. You could try using a Barlow but I'm not sure how that would effect the FOV and viewing. I'd suggest you borrow one first to see if it works
The other rather drastic action is to cut the OTA and shorten it. With a Newt I would adjust the main mirror height to acheive it. I had to do it to get my camera into the right place.
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