Patent ID: 6941068
Filing Date: 2005-09-06
Classification: G02B,H04N

Abstract:
1. An image pickup apparatus on which art image-taking lens can be mounted and exchanged, comprising: an image pickup device that receives an object image formed by the image-taking lens and photoelectrically converts the object image; a focus detection unit that detects an amount of defocus of the image-taking lens by phase difference detection method using light from the image-taking lens; a contrast detection unit that detects contrast of the object image using an output signal of the image pickup device; a processing unit that performs focusing of the image-taking lens; and a memory that stores a correction factor obtained from the detection result of the focus detection unit and the detection result of the contrast detection unit when the image-taking lens is mounted, the correction factor depending on the individual image-taking lens; wherein the processing unit corrects the detection result of the focus detection unit using the correction factor corresponding to the individual image-taking lens that is mounted when an image-taking operation is performed.