Ocular Lens

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The objective lens of a telescopic sight is also known as the entrance lens. The diameter is given in millimetres. It corresponds to the value after the x. E.g. a 5-25×56 has an objective lens with 56mm diameter. The diameter of the objective lens determines the amount of light that can reach the eye. With a constant magnification, an increase in the objective lens diameter leads to an enlargement of the exit pupil.

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