Binocular Mirror Mount

I had never seen one of these before but heard about a commercial version last week. Next thing I know I've bought a front surface mirror and put this together yesterday. I think it's going to work out nice.



More details and images are available on my web site www.craigcolvin.com/Astronomy

It was too cloudy to try last night but there appear to be a few holes in the clouds tonight so I'm hoping to give it a try.

I have always had a question about these, perhaps only of "intellectual interest".

Say I want to mount a red-dot or green-laser or straight-through finder. Because the reflected axis (where in the sky the bino is pointing) moves twice as much as the mirror's tilt, what mechanical contraption would be needed to keep the finder aligned with the reflected axis?

8O

-- William (Saratoga, CA)