What do the numbers on a pair of binoculars mean, like 10 X 50?
When buying a pair of binoculars, these descriptive numbers indicate first, the magnification of the binoculars, second the diameter in millimeters of the objective lens. The magnification of binoculars means that with a magnification factor of 10, objects will appear 10 times closer. The larger the objective lens, the more light the binoculars collect, making twilight or astronomical viewing possible. Both of these factors are relevant to the manner in which you use your binoculars. A general rule of thumb with binoculars is that bigger isn’t always better.
