| 摘要 |
An automatic focusing apparatus includes: a focus detector (114) photoelectrically converting at least a part of a photographing beam; a defocus computer (118) calculating a defocus amount based on an output of the focus detector; a driver (103) driving a focus lens (101) based on the defocus amount; and a unit (121) setting a maximum time period for charge accumulation in the focus detector (114). If the accumulated charge in the focus detector (114) reaches a threshold within the period, when the accumulated charge in the focus detector (114) reaches the threshold, the defocus computer (118) calculates a defocus amount using an output of the focus detector (114) and outputs the defocus amount to the driver (103). If the accumulated charge in the focus detector (114) does not reach the threshold within the period, when the period lapses, the defocus computer (118) calculates a defocus amount using an output of the focus detector (114) and outputs the defocus amount to the driver (103). |
