I'm confused. That's not actually uncommon but perhaps I can get this one cleared up. Do all 8x42 binoculars have the same size exit pupil? Or does exit pupil refer to the diameter of the ocular lenses? I'm asking because it sounds like some 8x42 devices have trouble with blackouts from eye placement within the exit pupil and others do not. Thanks for helping me out with this.Buy a glass with a larger exit pupil.