Focus adjustment apparatus

摘要

A focus adjustment apparatus includes a diaphragm aperture adjustment unit configured to adjust a diaphragm aperture area of a photographic lens, a focus detection unit configured to detect a defocusing amount by using a pair of light fluxes passed through different areas of the photographic lens, a detection result correction unit configured to calculate, during focus detection after the diaphragm aperture area has changed by a value equal to or larger than a predetermined value, a reduced defocusing amount correction value with respect to the defocusing amount, and a focus adjustment unit configured to execute control to adjust a focus based on the defocusing amount correction value.

主权项

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.