Patent ID: 6847785
Filing Date: 2005-01-25
Classification: G03B

Abstract:
1. A camera system comprising a lens apparatus with an image-taking optical system including a focus lens unit and a camera on which the lens apparatus is mountable, the camera system comprising: a focus detection unit which detects a focusing state of the image-taking optical system; a controller which controls the driving speed of the focus lens unit and controls the focus detection unit to perform a focus detection operation at least once while the focus lens unit is moved; and a photometric unit which measures the brightness of an object; wherein the controller drives the focus lens unit at a first speed and a second speed lower than the first speed while the focus lens unit is moved toward an in-focus position, the focus detection unit performs a final focus detection operation out of at least one focus detection operation while the focus lens unit is driven at the second speed, before the focus lens unit reaches the in-focus position, and the controller determines the second speed based on the photometric result by the photometric unit and information on an amount of movement of a focal point of the image-taking optical system with respect to an amount of movement of the focus lens unit.