How to Collimate Binoculars?

The collimation screw tilts the prism against the tension of the spring clip. Look through both eyepieces, and rotate each screw by no more than one eighth of a turn at a time to see what effect it has on the image, then return the screw to its original position.

How do you adjust binoculars?

Rotate the focusing ring until you see a sharp image of it. Then, focus with your right eye with diopter adjustment ring on the right eyepiece. Look at the same object through the right eyepiece with your right eye. Rotate the diopter adjustment ring (usually located on the right eyepiece) until you see a sharp image.

Why am I seeing double through binoculars?

Double vision usually indicates that the binoculars are out of collimation. Now, what is collimation? It is the process of aligning all components in both lenses of binoculars to bring light to its best focus. If this process somehow gets interrupted, the binoculars register different images on each side.