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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Alpen Rainier 10x42mm EDHD Binocular

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Alpen Teton 10x50mm EDHD Binocular

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