| 摘要 |
PURPOSE:To increase the response speed of AF operation without lowering focusing accuracy by performing defocusing arithmetic operation according to the quantity of defocusing or the charge storage time of an image sensor. CONSTITUTION:This device has a 1st arithmetic method which calculates the quantity of defocusing from individual output values of photodetector constituting the image sensor and a 2nd arithmetic method which use output data less than the number of the photodetector by combining and using plural photodetectors as one element or thinning out the photodetector and then calculates the quantity of defocusing. Then one arithmetic method is selected according to the quantity of defocusing by the defocusing arithmetic operation or the charge storage time of the image sensor. Namely, the arithmetic speed of the quantity of defocusing is increased according to the defocusing quantity or the charge storage time of the image sensor. Consequently, the response speed of the AF operation is increased without lowering the focusing accuracy. |
