Either mechanical and/or electronic shutters are possible. Mechanical systems can use a leaf (or iris) shutter or curtain shutter. In digital cameras a third alternative is also possible: the electronic shutter. This works by activating and then deactivating the CCD so that no further light can be recorded, regardless of whether light is hitting the CCD. The shutter controls the exposure time, which can range from thousandths of a second to several minutes or more. Fast shutter speeds freeze action, slow speeds are more suited to stationary subjects. A tripod is recommended for slow exposure shots to avoid camera shake. (Aperture)
| Shutter Priority In this mode, the user can adjust the shutter speed manually and the camera then selects the aperture setting for the best exposure. Often described as “S” mode on the camera. |
Shutter time lag
Time between the instant the release is fully depressed and the actual moment of capture. This does not include the time when the release is half depressed to activate (if available) the autofocus system, etc.
