I'm not too familiar with binoculars is general, so here is my issue
I have a pair of old 8x40 porro prism binocs. Bought them about 40 years ago. I'd use them occasionally. Never been dropped or mishandled but I've discovered that they now produce a double image, kind of like when you try to focus with eyes crossed. Only when I pivot them so the two sections are closest together does the image become one again, as I slowly pivot them apart to a comfortable viewing position the double vision comes back.
What happened? Is there a remedy for this?
Thanks in advance,