Patent ID: 7929046

Claim:
An image-pickup system which includes an image-pickup apparatus and a lens apparatus that is removably mounted on the image-pickup apparatus, comprising: a first memory which is provided in the image-pickup apparatus and stores first identification information unique to a combination of the image-pickup apparatus and a certain lens apparatus; a second memory which is provided in the lens apparatus and stores second identification information unique to a combination of the lens apparatus and a certain image-pickup apparatus; and a comparator, a generator, and a controller, which are provided in one of the image-pickup apparatus and the lens apparatus, wherein the comparator compares the first identification information stored in the first memory with the second identification information stored in the second memory, wherein, when the comparison by the comparator results that the first identification information does not match the second identification information, the generator generates a random number as identification information unique to the combination of the image-pickup apparatus and the lens apparatus, and wherein the controller causes the first memory and the second memory to store the random number generated by the generator as the first identification information and the second identification information, respectively.