Originally Posted by Hermann
Nice interview, and some interesting answers.
You forgot to ask the most obvious question though: Why on earth is the diopter correction range of their binoculars only +/-3 diopters?
Here is what an engineer at Meopta told me some time ago:
"The dioptric compensation between the eyes, nominally listed as +/- 3D, is bigger and minimum difference we measure is +/- 6D."
I know you need -4d, so you should be fine.