Binoculars are labeled with a set of numbers such as 8X30.The first numbers states the power of the binoculars (8x or a power). The second numbers represent the diameter of the objective lens in millimeters (30mm). The diameter of the instrument, with the greater light gathering ability of the instrument, with the greater light gathering ability of a larger lens translating into greater detail and clarity. This is especially useful in low light conditions and at night.
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