Abstract: A shading device employed in a lens barrel having a plurality of lens groups includes a plurality of substantially tubular shading members provided between a first lens group and a second lens group that move relative to each other along the optical axis and overlap each other along the optical axis so as to allow the shading device to achieve a telescopic function.

Abstract: A shading device employed in a lens barrel having a plurality of lens groups includes a plurality of substantially tubular shading members provided between a first lens group and a second lens group that move relative to each other along the optical axis and overlap each other along the optical axis so as to allow the shading device to achieve a telescopic function.

Abstract: A vibration reduction device includes a vibration detection device for detecting vibrations, a vibration reduction optical system for reducing the vibrations by its movement, a vibration reduction optical system drive device for driving the vibration reduction optical system on the basis of the detection result of the vibration detection device, a memory device for storing a predetermined frequency region, a comparison device for comparing the stored frequency region with the frequency of the vibrations detected by the vibration detection device, a lock device for locking the operation of the vibration reduction optical system, and a control device for controlling the lock device on the basis of the comparison result of the comparison device.

Abstract: An optical device has an image blurring motion compensation mechanism with a locking device. When centering of a blurring motion compensation optical system is not performed, it is possible to lock the optical system but, at the same time, worsen the blurring motion compensation effect. The optical device with a blurring motion compensation mechanism is able to prevent such image blur worsening by constructing the blurring motion compensation mechanism from a blurring motion detector to detect blurring motion, a blurring motion compensation optical system to compensate for blurring motion detected by the detector by moving the optical axis of the optical system, a blurring motion compensation system drive device to drive the blurring motion compensation optical system, and a blurring motion control device to control the blurring motion compensation optical system drive device, based on the output of the blurring motion detector.