An imaging system is provided with an imaging device and either a first accessory or a second accessory mounted to the imaging device. The first accessory is capable of external operation, and has a first operating member which generates an electrical output according to the external operation of the first accessory. The second accessory is capable of external operation, and has a second operating member which generates an electrical output according to the external operation of the second accessory. The second accessory also has a data preparation device which prepares data based on the electrical output generated by the second operating member. The imaging system further has a discriminating device and electrical receptors. The discriminating device determines whether the first accessory or the second accessory is mounted to the imaging device. The electrical receptors receive the electrical output from the first operating member when the discriminating device determines that the first accessory is mounted to the imaging device and receive data prepared by the data preparation mechanism when the discriminating device determines that the second accessory is mounted to the imaging device.