Zooming monocular or binoculars

摘要

A zooming monocular or zooming binoculars having an objective optical system and an eyepiece optical system, which includes at least one variable power lens group driven in the optical axis in the eyepiece optical system, a movable field stop which is provided to define the field of view, so as to move in the optical axis direction independently of the variable power lens group, and driving means for moving the movable field stop in association with the movement of the movable variable power lens group in the optical axis direction, along a track different from a track of the movable power lens group.