S stands for Shutter. This mode is used often when shutter speed is of utmost concern, for example when shooting moving objects such as birds or even water. The silky effect that you often see in images of waterfalls or rivers is achieved using this technique.
For sports and wildlife, the “ideal” shutter speed will depend on the movement speed of the subject and also the photographer’s response speed. It can range from 1/200 secs to as high as 1/500 secs.
For rivers and waterfalls, it also depends on the speed of water flow as well as how much of an effect is desired. As a general guide, 2-5 secs would be a good start. Note that this would be impossible without a fairly sturdy tripod as any shake will result in a failed attempt. Even the best VR (refer to Vibration Technology) technology cannot substitute a good tripod for such long exposures.
Other camera modes: Program, Aperture priority, Manual
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