Patent ID: 7677818

Claim:
A camera to which a plurality of types of photographing lenses can be detachably attached, comprising: a nonvolatile memory which can register one or more pieces of specific information of the photographing lenses; a volatile memory which is operable at a speed higher than that of the nonvolatile memory; and a control circuit which copies a part or all of the information registered in the nonvolatile memory to the volatile memory at an initial stage of a camera operation and which thereafter controls the camera operation by use of the information stored in the volatile memory, wherein the control circuit judges, at a predetermined timing including a lens attaching operation, whether or not the specific information of the attached photographing lens has already been stored in the volatile memory, and, when the control circuit judges that the specific information has not been stored, the control circuit acquires the specific information of the attached photographing lens from the attached photographing lens to store the acquired specific information in the volatile memory, and when the control circuit judges that the specific information has been stored, the control circuit does not perform the acquisition.