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 Audubon 820T 8.5x44mm Waterproof Binocular

$599.99

Swift 930 Ultra 10x42mm Waterproof Binoculars

$549.99

Swift 747 Reliant 8x40mm Porro Binocular

$114.99

Swift Reliant 743 7-21x25mm Compact Zoom Binocular

$119.99
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