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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Sig Sauer Zulu9 11x45mm Binocular

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Sig Sauer Zulu7 10x42mm Binocular

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