| 摘要 |
Binoculars (1) have a pair of displaceable optical elements (21L, 21R), which are at least parts of objective optical systems, respectively, a focusing mechanism (5) used to move the displaceable optical elements for focusing, and a pair of guide rails (31L, 31R) that guide the displaceable optical elements, respectively, when they are moved. The pair of guide rails have inclined portions which incline with respect to the optical axes of the objective optical systems, respectively. A pair of engagement portions are formed on a pair of frames of the displaceable optical elements, respectively. The engagement portions are engaged with the guide rails, respectively. When the displaceable optical elements are moved for focusing with the pair of engagement portions being engaged with the inclined portions of the pair of guide rails, respectively, a distance between the optical axes of the pair of displaceable optical elements changes, thereby a convergence value being compensated. |
