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What is Objective Lens Size?

Lens Objective size
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What is Objective Lens Size?

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The second number in the formula (8×32) is the diameter of the objective front lens. The larger the objective lens, the more light that enters the binocular and the brighter the image.

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The second number in the formula (4×40) is the diameter of the objective or front lens. The larger the objective lens, the more light that enters the scope, and the brighter the image.

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