| 摘要 |
PROBLEM TO BE SOLVED: To improve focusing accuracy by restraining the influence of aperture reduction on the amount of movement of an image plane. SOLUTION: On the basis of the luminance and photographing stop value of an AF area, an AF stop value (a stop value when detecting a focal point) is determined. Basically, the AF stop value is equal to the photographing stop value. However, according to the luminance, the AF stop value becomes smaller than the photographing stop value. Even when the AF stop value is smaller than the photographing stop value, a difference between the stop values is minimized so as to prevent the AF stop value from becoming equal to the open stop value. When a focus detection stop value is not coincident with the photographing stop value, the position of a focus lens can be corrected according to the difference (the amount of movement of an image plane, caused by the difference between them). COPYRIGHT: (C)2008,JPO&INPIT |
