Patent ID: 8508655

Claim:
A lens apparatus having a lens, which is detachably mounted on an image capture apparatus, comprising: a lens-information storage unit configured to store correction information for light falloff at edges, which are characteristic information about aberration of the lens; a communication unit configured to communicate with the image capture apparatus; and a control unit configured to carry out control of transmitting the correction information for light falloff at edges stored in the lens-information storage unit to the image capture apparatus through the communication unit upon receiving an instruction from the image capture apparatus through the communication unit, the transmitting being periodic, the correction information for light falloff at edges comprises a three-dimensional array including a plurality of zoom positions, a plurality of focus positions, and a plurality of iris positions of the lens and, for each combination of zoom position, focus position and iris position, a plurality of coefficients corresponding to a polynomial equation that describes the light falloff at edges, wherein the image capture apparatus is operable to transmit a command to the lens apparatus for purposes of inquiring about a flag indicating whether or not the lens apparatus retains the correction information, and wherein when the image capture apparatus receives no response from the lens apparatus in reply to transmission of the command, it is determined that the lens apparatus does not retain the correction information, wherein upon receiving the instruction from the image capture apparatus, the lens apparatus makes a determination about the iris position, focus position and zoom position of the lens at the time of receiving the instruction, reads out the correction information for light falloff at edges corresponding to the determined iris position, focus position and zoom position, and transmits the read-out information to the image capture apparatus, such that the correction information for light falloff at edges received by the image capture apparatus in reply to the instruction includes only the correction information for light falloff at edges corresponding to the determined iris position, focus position and zoom position, and wherein the correction information for light falloff at edges is difference data which adjusts for the difference between light falloff at edges corresponding to the lens and light falloff at edges corresponding to another lens.