Patent ID: 8542301

Claim:
An electronic image pickup apparatus comprising: an image forming optical system which forms an image of an object, which comprises a plurality of lens units; and an image pickup element which comprises an image pickup surface which converts the image formed by the image forming optical system, to an electric signal; where the image forming optical system comprises a lens unit nearest to object side which is disposed nearest to an object side, an aperture stop which is disposed on an image side than the lens unit nearest to object side, and an image-side lens unit which is disposed on the image side than the aperture stop, and the lens unit nearest to object side comprises a lens having a mark formed on an effective area of a lens surface thereof, and at least any one of the lens in the image forming optical system is held such that, a shifting or a tilting of the lens can be adjusted, and the electronic image pickup apparatus further comprising: a correction parameter storage section which stores correction parameters for correcting an unevenness of brightness due to the mark; and a signal processing section which corrects the unevenness of brightness due to the mark of which, an image has been picked up by the image pickup element, based on the correction parameter which has been stored in the correction parameter storage section.