OK, maybe I'm too stupid to own the AP Barcon 2" Barlow, but I can't figure out how to use a single 48mm filter cell with the Barcon lens cell and Baader binoviewer. Whether using the prism diagonal (refractor) or plain nosepiece (Newt), there is no way to thread a 48mm cell into the light path.
What am I missing here? Duct tape?
What am I missing here? Duct tape?