magnification

Binocular Exit Pupil Calculator

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BINOCULAR TOOLS / EXIT PUPIL Find the exit pupil behind the numbers. Enter the two numbers on a binocular specification, such as 8×42. The calculator divides objective diameter by magnification to give the theoretical exit pupil in millimeters. YOUR BINOCULAR SPECIFICATION Enter magnification and lens size For an 8×42 binocular, enter 8 for magnification and

8×42 decoded: what the numbers on binoculars actually tell you

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What Do The Numbers On Binoculars Mean

The numbers printed on binoculars tell you less than a full specification sheet does. In 8×42, the first number is magnification and the second is the objective lens diameter in millimeters, while field of view, close focus, eye relief, and physical fit still need separate checks. Exit pupil is one useful value you can calculate