Electronic camera
AssigneeNikon Corporation
InventorTsutomu Wakabayashi
Life of this patent
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Abstract
If an electronic camera is set in an image-capturing sensitivity automatic control mode, a program autoexposure calculation is executed based upon the subject brightness and the image-capturing sensitivity setting to determine a control aperture value and a control shutter speed. If the correct exposure is not achieved, a control exposure sensitivity is calculated based upon the exposure deviation and the image-capturing sensitivity setting is adjusted accordingly. If an internal flash unit or an external flash unit is utilized, an autoexposure calculation is executed by using the flash unit synchronizing speed, the subject brightness and the image-capturing sensitivity setting to determine the control aperture value.
Claims18
An electronic camera comprising:
- an image-capturing device that captures an image of a subject through a photographic lens;
- a brightness detection device that detects a subject brightness;
- a first exposure calculation circuit that performs an exposure calculation by using an exposure sensitivity set at the image-capturing device, an exposure time length set at the image-capturing device, an aperture value set at the photographic lens and the subject brightness detected by the brightness detection device, and calculates a first control exposure by changing at least the exposure sensitivity among the exposure sensitivity, the exposure time length and the aperture value if the correct exposure is not achieved;
- and
- a control circuit that allows the first exposure calculation circuit to calculate the first control exposure if a specific condition is satisfied.
Dependencies are inferred from the claim text.