exit pupil diameter in mm - Binocular Logic

Binocular Exit Pupil Calculator

Oct 23, 2026 by Binocular Logic Editorial Team

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