Patent ID: 9571825
Date: 2017-02-14
CPC Classifications: G02B,G03B,H04N

Claim:
1. A lens apparatus comprising: an imaging optical system for forming the image of a subject on an imaging plane; an extender optical system capable of changing over among multiple imaging magnifications; a master optical system for adjusting in-focus position; a master optical system adjustment amount history memory for storing a history of amounts of adjustment of said master optical system obtained by adjusting the in-focus position by said master optical system per each of the multiple magnifications of said extender lens optical system; a malfunction detection unit for detecting whether or not there is a malfunction in the optical systems of the lens apparatus based upon multiple histories that have been stored in said master optical system adjustment amount history memory per each of the multiple magnifications of said extender lens optical system; and a malfunction notification unit for giving notification of a malfunction in response to detection of the malfunction by said malfunction detection unit.