Beecher Mirage Binoculars 7x

I recently inherited this pair of 10 by 50 binoculars and I thought great free binoculars I took them outside the very same night looked up at the star and what I saw instead of a single star simulated here with this ball bearing was this two star images where there should only be one it turned out that the lower one on the right corresponding to the right side of the binocular and this was left side what I needed to do was align the monocular so that both optical paths were parallel to each other so that the two images would be merged into one this video explains some of the tricks about how to do that and some of the price you pay if you do in this video I'm going to define collimation as referring to the process of collimating the front objective the prisms inside the body and the eyepiece so that the light travels in a concentric manner in other words all being all the light is para