CAMERA HAVING A FOCUS DETECTION DEVICE AND INTERCHANGEABLE LENS

A focus detection device for a camera which corrects the focal point position of an interchangeable camera lens. The focal point position is corrected according to data indicating interchangeable lens characteristics, and according to data indicating characteristics of a focus detection device. The data indicating characteristics of the interchangeable lens is data representing the field curvature of the interchangeable lens which is stored in a memory located in the interchangeable lens. The data indicating characteristics of the focus detection device is data representing the size of a detection aperture of the focus detection device, a direction of detection, and a position of the detection region within a photographic image surface. This data is stored in a memory located in the camera. Reliable focal point correction may be performed when the interchangeable lens is mounted on a camera loaded with a focus detection device having optional detection aperture size, detection direction, and detection position. Furthermore, the quantity of data which has to be stored in the memory of the interchangeable lens is decreased. Focal point correction for an interchangeable lens may also be performed when plural focus detection devices in the camera perform focal point detection in plural detection regions.