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In photography, shutter speed or exposure time is the length of time that the film or digital sensor inside the camera is exposed to light (that is, when the camera's shutter is open) when taking a photograph. [1] The amount of light that reaches the film or image sensor is proportional to the exposure time.
Some classic camera's exposure guides show the old conversion as they were valid at the time of production, for example the exposure guide of the classic camera Tessina (since 1957), where 21/10° DIN is related to ASA 80, 18° DIN to ASA 40, etc. Users of classic cameras may become confused if they are not aware of the historic background of ...
Digital camera manufacturers have made consistent improvements in the dynamic range captured by their products, with modern cameras having over 14 stops of dynamic range. [11] Some cameras have an automatic exposure bracketing mode, to be used in conjunction with high-dynamic-range imaging software.
Digital cameras can achieve similar results (high dynamic range) by combining several different exposures (varying shutter or diaphragm) made in quick succession. Today, most cameras automatically determine the correct exposure at the time of taking a photograph by using a built-in light meter , or multiple point meters interpreted by a built ...
The exposure range of a device is usually expressed in stops, which are equivalent to where c is the medium or device's contrast ratio. For example, average Digital Video (DV) has a contrast ratio of 45:1, so its exposure range is roughly 5.5 stops. [1] Film has an exposure range of approximately 14 stops. [2]
By leaving the camera's shutter open for an extended period of time, more light is absorbed, creating an exposure that captures the entire dynamic range of the digital camera sensor or film. If the camera is stationary for the entire period of time that the shutter is open, a very vibrant and clear photograph can be produced. [4]