In a binocular name, the first number indicates the magnification power and the second number is the diameter of the objective lens in mm. For example, for a pair of Nipon 10x42 binoculars, it has 10x magnification (i.e., an object will be enlarged 10 times; or an object 100m away will look like 10m away through the binoculars), and its objective (front) lens is 42mm in diameter.
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