| 摘要 |
In a binocular, an operating knob member is provided for operating an adjusting mechanism such as a diopter difference adjusting mechanism by rotation thereof. The operating knob is arranged to be shiftable between two positions in which the amount of the externally protruded portion of the knob is relatively small and large, respectively. When the operating knob is operated, it is positioned at its largely protruded position, while when the operating knob is not necessary, it is positioned at its less protruded position.
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