Abstract: A camera system for communicating data including focal length data between a micro computer in a camera body and a zoom lens mounted to the camera body, wherein the zoom lens includes a position detecting device which detects divided focal length steps corresponding to optional focal lengths of the zoom lens, a specific focal length outputting device which outputs at least one focal length of the focal length step detected by the position detecting device, and an arithmetic operating device which calculates a focal length for each focal length step in accordance with the data of the position detecting device and the specific focal length outputting device.

Abstract: A camera system for communicating data including a K value of an automatic focusing drive pulse coefficient between a micro computer on a camera body and a zoom lens mounted to the camera body. The zoom lens includes a position detecting device which detects one of a plurality of divided focal length steps corresponding to a focal length of the zoom lens. A K value outputting device outputs a K value at a telephoto extremity or wide angle extremity of the zoom lens, and an arithmetic operating device calculates the K value at each focal length step in accordance with the data of the position detecting device and the K value outputting device.

Abstract: A camera system is provided which includes a camera body having a body microcomputer and an interchangeable photographing lens having a lens microcomputer that is connected to the body microcomputer to effect data communication therebetween. The body microcomputer includes an AF controller for performing auto focus control, and an F-number transmitting device for transmitting a permission F-number set in the camera body to the lens microcomputer so as to effect the auto focus control in accordance with the AF controller. The lens microcomputer includes an arithmetic operation device for calculating an open F-number at an optional focal length, a comparator for comparing the permission F-number transmitted by the F-number transmitting device with the open F-number calculated by the arithmetic operation device, and a judgment data setting device for setting AF judgment data which determines the permission of the auto focus control in accordance with the detection result of the comparator.

Abstract: A camera system for communicating data between a micro computer in a camera body and a macro lens mounted to the camera body. A K value of an automatic focusing drive pulse coefficient is transmitted from the macro lens to the micro computer of the camera body. The macro lens includes a position detecting device for detecting one of a plurality of divided photographing distance steps that correspond to the photographing distance of the macro lens. A K value outputting device outputs a K value at a specific photographing distance of the macro lens, while an arithmetic operating device calculates the K value in a macro-photographing position of the macro lens in accordance with data of the position detecting device and the K value outputting device.

Abstract: A camera system for communicating data between a micro computer on a camera body and a zoom lens mounted to the camera body, wherein at least exposure data on the diaphragm is transmitted from the zoom lens to the micro computer of the camera body, and wherein the zoom lens includes a position detecting device for detecting one of the divided focal length steps corresponding to a focal length of the zoom lens, a memory for storing data peculiar to the zoom lens, and an arithmetic operating device for calculating the exposure data on the diaphragm in accordance with the data of the position detecting device and the memory.

Abstract: An electronic flash control device makes sure that the emission of light of an electronic flash is not impaired by a noise component signal prior to generation of a suitable quantity of light by the flash. A trigger signal is applied by the control device to allow the flash to emit light. An enable signal is supplied to a quenching circuit a predetermined time after the noise of the trigger signal has been produced. When the quantity of light from an object to be photographed by the camera reaches a certain value and the enable signal occurs, the quench circuit suppresses the emission of light by the electronic flash.