Patent ID: 8638388

Claim:
A lens apparatus detachably attachable to a camera apparatus, the lens apparatus comprising: an image taking optical system; a memory configured to store aberration correction data being used for image correction processing corresponding to aberration of the image taking optical system, the image correction processing being performed on an image captured by the camera apparatus through the image taking optical system; and a data sending part configured to send the aberration correction data to the camera apparatus, wherein the data sending part is configured to: determine partial data that is part of the aberration correction data depending on at least one of (a) a position or a state of an optical adjustment member included in the image taking optical system or (b) information on an image pickup element provided in the camera apparatus, to calculate, in a case where the partial data includes a plurality of numerical values, an approximate expression of the plurality of numerical values; in a case where a difference between the approximate expression and the partial data is within an allowable range, send data including the approximate expression to the camera apparatus; and in a case where the difference between the approximate expression and the partial data is not within the allowable range, increase an order of the approximate expression.