| 摘要 |
<P>PROBLEM TO BE SOLVED: To minimize influence on exposure when an aperture is changed during video photographing. <P>SOLUTION: In accordance with an instruction to change an aperture value during video capturing, a stop-down amount of an aperture is gradually changed by a unit amount Δa until reaching a stop-down amount corresponding to the instructed aperture value. Each time the stop-down amount is changed by the unit amount Δa, a change amount Δs of sensitivity gain for maintaining proper exposure is calculated, and the sensitivity gain is controlled based on the calculation result. A variation amount of the aperture value corresponding to the unit amount Δa is smaller than a minimum change width of the aperture value in the aperture value change instruction. <P>COPYRIGHT: (C)2013,JPO&INPIT |
