Two numbers are found on every binocular. One is magnification. This is how many times an image has been magnified. Second, the dimension of the objective lens in millimeters. When you view a binocular through it, the objective lens will be the largest lens. The larger objective lens points towards your target, so the better light and details enter the eye. This formula gives an 8x32 binocular with a 32mm objective and 8-times magnification. Here are some more details if you still have questions about what numbers mean on binoculars. The numbers are usually larger, which means that the binocular's optical performance is greater. However, they also indicate the size of the object. A 6-x24 binocular can be carried in your shirt pocket. The 15x56 binocular, however, can be difficult to carry in one's hand. Hunting requires a compact binocular with enough power to view distant objects, but not too heavy to transport. A binocular with 8-10 power behind a 32-42mm lens is the best choice for hunters. Look for models that have these numbers, such as 8x32,8x42 or 10x42. Or, for light-gathering abilities, look for 10x50.