If you can’t see it, you can’t shoot it, and in many cases, you can’t see it, whatever it is, without a good pair of binoculars. To understand binocular magnification designations, note that it is the first number in a binocular description, such as 10x40. In this case, the binocular has a magnification power of 10, meaning that an object will appear 10 times closer than it would to your naked eye. The diameter of the objective lens (measured in millimeters) is the second number in the description, for example the 42 in a set of 8x42 binos. Typical sizes for objective lenses are 25-28mm for compacts, about 30mm for mid-sized units, 40 to 42mm for full-sized binoculars and 50mm and larger for long-range models.