Abstract: A lens barrel comprising bayonet type mount projections to detachably attach to a lens-fitting unit of a camera body having a photographic region, wherein mount projections are formed to avoid cross-section of light path area where object light is introduced in the camera body.

Abstract: A lens barrel comprising bayonet type mount projections to detachably attach to a lens-fitting unit of a camera body having a photographic region, wherein mount projections are formed to avoid cross-section of light path area where object light is introduced in the camera body.

Abstract: A lens barrel comprising bayonet type mount projections to detachably attach to a lens-fitting unit of a camera body having a photographic region, wherein mount projections are formed to avoid cross-section of light path area where object light is introduced in the camera body.

Abstract: A lens barrel comprising bayonet type mount projections to detachably attach to a lens-fitting unit of a camera body having a photographic region, wherein mount projections are formed to avoid cross-section of light path area where object light is introduced in the camera body.

Abstract: A camera system comprises a camera body; a lens barrel having a photographing optical system, which can be mounted at the camera body; a shutter release switch disposed at the camera body and operated to start a shutter release operation; and a first operating switch related to an operation of the camera system other than the shutter release operation. The first operating switch is disposed at the lens barrel so as to allow an operator to perform a batch operation of the shutter release switch and the first operating switch with the lens barrel mounted at the camera body.

Abstract: At a lens group position storage unit, the positions of a focus lens group and a zoom lens group detected at the time of a preset operation are stored. In response to an instruction for a go-home operation, a zoom lens group position comparison unit compares the current zoom lens group position with the position detected at the time of the preset operation. If the zoom lens group position assumed when the instruction for the go-home operation is issued is further toward the telephoto side relative to the zoom lens group position at the time of the preset operation, a defocus prevention unit issues a warning so as to prevent defocusing.

Abstract: At a lens group position storage unit, the positions of a focus lens group and a zoom lens group detected at the time of a preset operation are stored. In response to an instruction for a go-home operation, a zoom lens group position comparison unit compares the current zoom lens group position with the position detected at the time of the preset operation. If the zoom lens group position assumed when the instruction for the go-home operation is issued is further toward the telephoto side relative to the zoom lens group position at the time of the preset operation, a defocus prevention unit issues a warning so as to prevent defocusing.

Abstract: A camera system comprises a camera body; a lens barrel having a photographing optical system, which can be mounted at the camera body; a shutter release switch disposed at the camera body and operated to start a shutter release operation; and a first operating switch related to an operation of the camera system other than the shutter release operation. The first operating switch is disposed at the lens barrel so as to allow an operator to perform a batch operation of the shutter release switch and the first operating switch with the lens barrel mounted at the camera body.

Abstract: Lens barrel has a changeover member for changing the lens focusing operation between automatic focusing and manual focusing. The lens barrel includes an automatic focusing unit for automatically adjusting a focusing operation of the lens, a changeover unit for selectively choosing either the manual focusing unit or the automatic focusing unit, and a locking mechanism for prohibiting the changeover operation of the changeover unit.