Abstract: An optical communication device includes an adjustment device and a light receiving unit. The adjustment device includes a wedge prism, an actuator, a detection unit, and a control unit, and the control unit controls the actuator to reduce a difference between a result of detection by the detection unit and a reference.

Abstract: Binoculars including a range finding function capable of enabling the correction of image shake over a broad range are provided. The present invention is a binocular (1) having: a binocular body 2, objective lens systems (4), eyepiece lens system (6), a pair of shake compensation lens systems (8) for stabilizing images, lens actuators (10) for driving shake compensation lens systems, a shake detection sensor (12), a control device (14) for controlling the lens actuators, a laser light source (16) for emitting laser light from the first objective lens system through a first shake compensation lens system, a light receiving element (22) for receiving laser light reflected by an observed object through a second objective lens system and second shake compensation lens system, and a computing device (2) for calculating the distance to an observed object based on laser light received by a light receiving element.