Patent ID: 7880795
Filing Date: 2011-02-01
Classification: G02B,G03B,H04N

Abstract:
1. A lens apparatus, mountable on a camera apparatus having an image pickup element, the lens apparatus comprising: an optical system including a plurality of lenses and a plurality of extender lenses, one of the plurality of extender lenses being selectively locatable in the optical path; an aperture unit that adjusts the light quantity in the optical system; a controller that controls driving of the aperture unit by an aperture control signal according to brightness information from an image pickup element; and a memory that stores at least one set of correction data respectively corresponding to at least one extender lens of the plurality of extender lenses, each set being associated with discrete aperture values for one of the plurality of extender lenses, wherein the controller obtains interpolation data for aperture values between the discrete values based on the correction data set stored in the memory associated with the extender lens currently located in the optical path, and drives the aperture unit using an aperture control signal based on the interpolation data and the current aperture value.