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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Leupold BX-5 Santiam 10x42mm HD Binocular

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Tasco Focus Free 8x25mm Porro Prism Binoculars

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Leupold BX-4 Pro Guide 10x32mm HD Roof Prism Binocular

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Tasco Offshore 8x25mm Roof Prism Binoculars

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Leupold BX-4 Pro Guide 8x42mm HD Roof Prism Binocular (Kryptek Typhon Black)

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Tasco Essentials 10x25mm Porro Prism Binoculars

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Leupold BX-4 Pro Guide 8x42mm HD Binocular

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Tasco Essentials 10-30x50mm Porro Prism Binoculars

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Tasco Essentials 8-24X25mm Black Porro Prism Binoculars

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Tasco Essentials 10x50mm Porro Prism Binoculars

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Leupold BX-5 Santiam 12x50mm HD Roof Prism Binocular (Sitka Sub-Alpine)

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Tasco Essentials 16X32mm Roof Prism Binoculars

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