Patent attributes
Binoculars which include a pair of observation optical systems each having an objective optical system, an erecting optical system and an eyepiece optical system. The binoculars include a focusing mechanism that is used to move a part of the observation optical system for focusing, and a convergence value compensating mechanism that compensates for a convergence value by displacing displaceable optical elements which are at least parts of the objective optical systems, respectively, in association with actuation of the focusing mechanism. In this structure, a distance between optical axes of the eyepiece optical systems is adjustable in line with a width between eyes of a user. A maximum value of a distance between optical axes of the displaceable optical elements is smaller than a minimum value of the distance between the optical axes of the eyepiece optical systems.
