National Geographic 10×25 Compact Binocular
National Geographic compact binoculars have a attractive, pocket sized design. The fully coated BK-7 optics and solid mechanics enable a true colour picture replication.
*A diopter, is a unit of measurement of the optical power of a
lens or curved mirror, which is equal to the reciprocal of the focal
length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length