I bought these maybe 10 years ago. A couple of months after I bought them, I found that the slightest bump would throw the bino's out of collimation. At the time, I couldn't find a way to contact anyone at this site to return them so I ended up with a set of bino's I wasn't happy with. They do have a couple of screws to adjust the prisms and found myself having to adjust them every time I wanted to use them. The quality of the images weren't that good, slightly on the dark side. Unless Oberwerk has made some improvements to correct this collimation issue, I wouldn't recommend them.