A binocular is actually two identical telescopes mounted side-by-side and perfectly aligned to let the viewer view distant objects with both eyes. The alignment, commonly referred to as “collimation”, involves not only this mechanical alignment, but also the optical elements along the binocular optical axis. If this has not been not done properly, double images will be your fate, resulting in eyestrain and eventually headache. If the alignment is “out”, the image will not merge. Fortunately some binoculars do have  adjustment screws enabling you to collimate the prisms, but this should only be attempted by a skilled person.

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