Abstract: A lock pin is inserted into a hole of a lens holding frame in order to lock a blur correction lens when blur correction is not executed. An optical axis of the blur correction lens and an optical axis of a photographic optical system match when the blur correction lens and the lens holding frame have fallen in the gravitational direction by their own weight and the lock pin and the hole have come into contact with each other.

Abstract: A lock pin is inserted into a hole of a lens holding frame in order to lock a blur correction lens when blur correction is not executed. An optical axis of the blur correction lens and an optical axis of a photographic optical system match when the blur correction lens and the lens holding frame have fallen in the gravitational direction by their own weight and the lock pin and the hole have come into contact with each other.

Abstract: A lock pin is inserted into a hole of a lens holding frame in order to lock a blur correction lens when blur correction is not executed. An optical axis of the blur correction lens and an optical axis of a photographic optical system match when the blur correction lens and the lens holding frame have fallen in the gravitational direction by their own weight and the lock pin and the hole have come into contact with each other.

Abstract: A lock pin is inserted into a hole of a lens holding frame in order to lock a blur correction lens when blur correction is not executed. An optical axis of the blur correction lens and an optical axis of a photographic optical system match when the blur correction lens and the lens holding frame have fallen in the gravitational direction by their own weight and the lock pin and the hole have come into contact with each other.

Abstract: A lens bodytube has an auto-focusing mode in which a photographing lens is automatically driven to an in-focus position by a drive force of a motor and a manual focusing mode in which the photographing lens is driven to the in-focus position by manually rotating a distance ring. A movable member is driven to a first position in the auto-focusing mode and to a second position in the manual focusing mode. When the movable member is at the first position, it is coupled to the motor to transmit a drive force of the motor to a rotary ring which drives the photographing lens along an optical axis. When the movable member is in the second position, it is coupled to the distance ring to transmit a manual drive force from the distance ring to the rotary ring.

Abstract: A focusing device of a photographing lens for focusing by rotating a rotary tube relative to a stationary tube comprises a set-hold unit including a to-be-detected unit movable with the rotary tube and a detection unit movable to the to-be-detected unit; a first drive unit for driving the detection unit relative to the to-be-detected unit; the detection unit producing a distance signal representing a distance between the detection unit and the to-be-detected unit; a first drive control unit for controlling the first drive unit to keep the relative distance between the detection unit and the to-be-detected unit to a predetermined relation in accordance with the distance signal from the detection unit; a command unit for issuing a command signal; a second drive unit for driving the rotary tube; and a second drive control unit for controlling the second drive unit in response to the command signal from the command means to keep the relative distance between the detection unit and the to-be-detected unit to a pre

Abstract: A system camera provided with a rear conversion lens barrel interposed between an interchangeable photo-taking lens barrel and a camera body comprises a camera body having a focus detecting apparatus for detecting the amount of deviation of the image plane and a first converting device for correcting the amount of deviation of the image plane detected by the focus detecting apparatus, an interchangeable photo-taking lens barrel disposed forwardly of the camera body and having an interchangeable photo-taking lens and a first memory for storing therein data regarding the exit pupil position PO from the focal plane of the interchangeable photo-taking lens, a rear conversion lens barrel interposed between the interchangeable phototaking lens barrel and the camera body and having a rear conversion lens and a second memory for storing therein data regarding the magnification .beta..sub.R and focal length f.sub.