So I'm at the Heart of America Star Party. I'm at the swap meet. I'm browsing along and here's this fella with quite a few pair of binoculars and other assorted optical instruments laid out on the table. I look at some lens assemblies and porro prisms, glance at the spotting scopes and find myself at the binoculars. I pick up a pair of 20x60s and look through them. I ask the gentleman how much, fully expecting not to be able to afford them. After about the third time, my mind finally gets the message that yes, they are free. I ask to take them outside for a better look.
Satisfied that the binoculars were usable, I informed the gentleman that I would be glad to take them off his hands for him. A short time after getting back to my campsite, the luster of getting such a good deal was quickly wearing off. I attached the binos on my mount and looked at a distant tree. I almost immediately noticed I was having trouble fusing the two images reaching my eyes. After attempting to adjust the inter-pupillary distance (IPD), and the focus for each eye individually with no improvement in the image, I realized that there was a deeper problem. Casually inspecting the binoculars showed that there was very thick and sticky grease around the right eyepiece housing and adjusting the IPD caused the eyepieces to twist vertically. Still, I was confident that cleaning the dirty spots and lubricating the sticky spots would yield a functional set of binoculars.