# Shutter Speed

The amount of time that the shutter? stays open to allow light to enter the camera. Shutter speed determines how long the camera’s sensor is exposed to light. The longer the shutter speed the more light exposed to the sensor. However, the longer the shutter speed the more chance of a blurry image. The general rule is that shutter-speed should be no less than 1 over the focal length of the lens. So for a 300mm lens the shutter speed needs to be above 1/300 sec. Moving subjects require the use of fast shutter speeds in order to avoid motion blur.
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