Exit Pupil

Exit pupil is one of many factors used in determining an optic’s performance in low light. It is calculated by dividing the optic’s objective lens diameter by the optic’s magnification.1

footnotes/sources:

  1. Vortex Optics. “Vortex Jeapoprdy, Optics, 200.” Instagram, Vortex Optics, 14 Mar 2018, ~6 AM.