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What kind of shutter speed do you need for digital photography?
Shutter speed is defined as the time the shutter is held open during the taking of a photograph in order to allow light to reach the film or image sensor (that is used in digital cameras).The shutter speed regulates how much light the camera will record in combination with the variation of the lens aperture. For example: for any given exposure a fast shutter speed demands a larger aperture to avoid under exposure just like a slow shutter speed is offset by a very small aperture to avoid over exposure.For low light conditions such as at night long shutter speeds are often used. Shutter speed is always measured in seconds. For photographs taken in sunlight a typical shutter speed is 1/125th of a second. Shutter speed changes the way movement appears in a picture in addition to its overall effect on exposure.For very fast moving subjects it is best to use a very short shutter speed. Many sports use very fast shutter speeds to capture the peak moment and freeze it in time. If the photographer wishes to intentionally blur a moving subject he or she will use a very long shutter speed giving the finished photograph a very artistic effect.For example if you want to show the passage of time such as with a running river or waterfall then you can use a slower shutter speed. Now that you know what shutter speed how does it work with your digital camera?There are basically two types of shutters in digital cameras each quite different.Some cameras may have a plate that covers the image sensor found on the camera. The plate flips up and let's light onto the camera image sensor when you are shooting your photograph.The other type of shutter is called an iris because of the similarity in the way it works like a human eyeball.When you go to shoot a photograph the iris expands and let's light onto the cameras sensor.Either type of sensor (whether the plate stays up or the iris stays open) is still measured in the amount of time that it takes.Shutter speed is shown as measurements of fractions denoting the number of seconds. Here is an example of shutter speed numbers, from fast to slow:
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