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Sunlit subject shot on a digital camera set to ISO 100, exposed at f/8 at 1/400 second which is the same exposure value as f/16 for 1/100 second, the recommended "sunny 16" exposure In photography, the sunny 16 rule (also known as the sunny f /16 rule ) is a method of estimating correct daylight exposures without a light meter .
Current cameras do not allow direct setting of EV, and cameras with automatic exposure control generally obviate the need for it. EV can nonetheless be helpful when used to transfer recommended exposure settings from an exposure meter (or table of recommended exposures) to an exposure calculator (or table of camera settings).
Some cameras provide options for fine-tuning settings such as sharpness and saturation, which may be referred to as "Styles" or "Films". Some cameras offer color-altering settings to do things such as make the photograph black-and-white or sepia, swap specific colors, or isolate colors.
Digital cameras usually have variable ISO settings that provide additional flexibility. Exposure is a combination of the length of time and the illuminance at the photosensitive material. Exposure time is controlled in a camera by shutter speed, and the illuminance depends on the lens aperture and the scene luminance. Slower shutter speeds ...
Guide number distances are always measured from the flash device to the subject; if the flash device is detached from the camera, the position of the camera is irrelevant. Furthermore, unless a flash device has an automatic zoom feature that follows the setting of a camera's zoom lens, guide numbers do not vary with the focal length of lenses.
Yashica-D TLR camera front view. This is one of the few cameras that actually says "F-NUMBER" on it. From the top, the Yashica-D's aperture setting window uses the "f:" notation. The aperture is continuously variable with no "stops". By 1920, the term f-number appeared in books both as F number and f/number.
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Hardware and software ("firmware"), built into the camera, measures luminance of the subject and automatically sets shutter speed, lens aperture or sensitivity; this also allows the camera to set the aperture for manual lenses fixed with an AE chip. [4] AE-L or AEL: Automatic exposure lock. Technology for holding an exposure setting from one ...