1. A camera which takes images through an image-taking optical system including a shake correction unit which drives a part of the image-taking optical system to correct image blur caused by camera shake, comprising: an image-pickup device which photoelectrically converts an object image formed by the image-taking optical system, and a control circuit which controls operations of the camera, wherein the control circuit changes the sensitivity and the exposure time of the image-pickup device whether the shake correction unit is in operation or not.