What do the numbers 10x40 mean for binoculars?
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Answer:
Every pair of binoculars is engraved with a formula, such as 7 x 35 or 10 x 40. The first number in the formula is the power, or how many times the image is enlarged. The second number in the formula is the diameter of the objective lens in millimeters. The bigger the objective, the more light can enter, and the greater the potential resolution of the image. With hand held binoculars there is a practical limit to power beyond which it is not useful. Depending on the individual, as the power increases, hand tremor begins to degrade the image. Binoculars over 10 power usually require tripod mounting.
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