Abstract: A lock releasing device a camera that is disposed on a camera body and can release by an external operation a lock of a lens locking mechanism that locks an interchangeable lens mounted on the camera body which includes a lock releasing part that can release the lock of the lens locking mechanism 2 imparting a predetermined displacement amount Sm, and a lock releasing ring that is disposed at a coaxial position to the interchangeable lens L in such a manner as to transmit the predetermined displacement amount Sm to the lock releasing part and enable the external operation.

Abstract: A lock releasing device for camera 1 that is disposed on a camera body side C and can release a lock of a lens locking mechanism 2 that locks an interchangeable lens L mounted on the camera body side C by an external operation, comprising a lock releasing part 3 that can release the lock of the lens locking mechanism 2 by imparting a predetermined displacement amount Sm and a lock releasing ring 4 that is disposed at a coaxial position to the interchangeable lens L in such a manner as to transmit at least a predetermined displacement amount Sm to the lock releasing part 3 and enable external operation.

Abstract: Diaphragm device of a lens includes a click mechanism with a locking portion disposed in one of a stationary tube and a diaphragm setting ring, the locking portion having an elastically supported locking element, and an entrapment body disposed on the other of the stationary tube and the diaphragm setting ring. The entrapment body having an entrapment surface wherein a plurality of entrapment portions are formed for catching the locking element pressed against the entrapment surface at one of a plurality of aperture numbers when the diaphragm setting ring is turned. A mode select mechanism for switching between a click mode wherein the locking element is pressed against the entrapment surface and a non-click mode wherein a click function is deactivated with the locking element and the entrapment surface separated from each other by altering the position of at least one of the locking portion and the entrapment body.