This is where the focus wheel on a pair of binoculars comes into play. Adjusting the wheel changes the distance between the prisms and the eyepiece and, therefore, the eventually focal point of ...

When you stop and think about it, binoculars are cool bits of kit. Compact and convenient, they enable you to bring distant ...

While binoculars share many attributes — parallel magnified tubes governed by a common focus control — they’re more different than their generic appearance might suggest, and their wide variation ...