The “42” in our 10x42 binocular refers to the diameter of the objective (front) lens in millimeters. Since the objectives will often be the largest portion of the optic, it will affect the overall size and weight of the binocular, and how much light it can gather.

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Swift 930 Ultra 10x42mm Waterproof Binoculars

$549.99

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Firefield Emissary 10x32mm Binocular

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