Patent ID: 8988585
Filing Date: 2015-03-24
Classification: G02B,G03B,H04N

Abstract:
1. A focus adjustment apparatus comprising: a first adjustment unit configured to execute control to adjust a diaphragm aperture area of a lens unit; a detection unit configured to detect a defocusing amount; a second adjustment unit configured to execute control to adjust a focus based on the defocusing amount; and a controller configured to control, when the diaphragm aperture area has been changed larger than a predetermined amount, the second adjustment unit to reduce a changing of focus based on the defocusing amount, wherein the controller is configured to multiply the defocusing amount by a correction coefficient that is a positive number less than 1, wherein the controller has a first correction coefficient, and a second correction coefficient larger in value than the first correction coefficient, and wherein the first correction coefficient is used during focus detection after the first adjustment unit has changed the diaphragm aperture area to be larger, and the second correction coefficient is used during focus detection after the first adjustment unit has changed the diaphragm aperture area to be smaller.