Binocular numbers2/18/2023 You’ve now cracked the equation, but what is the right combination for your needs? To determine your best binocular strength and objective lens diameter, look at your primary location. So, an 8×42 binocular will have an exit pupil of 5.25 millimeters. Divide the objective lens diameter by the magnification power. This can compromise how easily they’re packed, held or used.īONUS PRO TIP: You can determine your binocular’s exit pupil size with a quick equation. However, larger lenses can add weight to the binoculars themselves. A larger objective lens can allow more light to pass through and create brighter, sharper viewing conditions. So, a binocular with “42” listed for its objective lens will have two lenses 42 millimeters in diameter. While binoculars have two objective lenses, each is the described diameter. The objective lens diameter is the second number in the equation. “So, any image I see through these is going to be magnified eight times,” Hamilton says. For example, an 8×42 binocular carries a magnification of 8 power. To begin, binoculars are identified by their power and objective lens diameter. Use these optics Pro Tips during your next outing and get your sight right. But which binocular configuration is necessary to achieve that perfect picture? Vortex Optics’ Chief Media Ambassador Jimmy Hamilton has a quick overview to help you better understand binocular magnification. Whether panning over your hunting ground or capturing a glimpse of a passing bird, binoculars can be great optical tools.
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