| 摘要 |
The binoculars include a focusing mechanism and a convergence value compensating mechanism. A convergence value is compensated by turning displaceable elements which are at least parts of the objective optical systems, respectively, centering around straight lines parallel to the optical axes thereof in association with actuation of the focusing mechanism to vary a distance between the optical axes of the displaceable elements. When viewed along the optical axis direction of the objective optical systems, a condition alpha≈beta is satisfied, where, alpha represents an inclination angle of a line segment connecting the centers of the displaceable elements with the turning centers thereof, respectively, with respect to the vertical direction of the binoculars in a state where an object at infinity is focused, and beta represents an inclination angle in a state where an observation object at the shortest distance is focused.
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