WHY EYEPIECE FOCUS?

Those who have become used to centre focus binoculars get to like them so much that they object to binoculars that are eyepiece focus. With centre focus you must turn the centre wheel to focus both eyes but have only one eye open (usually the left) then you must shut the left eye and focus the right eye by turning the eyepiece, then you turn the centre wheel again to focus both eyes together, first on something nearby then something far away, and if one eye is slightly out of focus you start again. Why people fall in love which such a complicated system I really don't know, eyepiece focus is so much simpler. With eyepiece focus you turn each eyepiece separately (focus the left eye, focus the right eye). All military binoculars use this system. The eyepieces on military binoculars will be marked clearly in dioptres (+ and - with zero in the middle for 'normal'). You remember your dioptre number for each eyepiece then if you lend the binocular to someone and they focus it differently, ...  more