Changing the shutter speed gives you control over whether to “freeze” or suggest motion. In contrast, slower shutter speeds are suited to suggesting the motion, such as that of flowing water or other moving subjects. In other words, the faster the shutter speed the easier it is to photograph the subject without blur and “freeze” motion and the smaller the effects of camera shake. An easy way to know the Shutter Count number of your Canon EOS, Nikon, Sony cameras Know exactly how many shutter actuations your cameras have. Fast shutter speeds will “freeze” motion, while slow shutter speeds introduce blur from two sources: camera movement (camera shake) and subject movement (for information on this topic, see “ Camera Blur and Motion Blur”). If you are photographing a subject that is in motion, you will get different effects at different shutter speeds. The faster the shutter speed, the shorter the time the image sensor is exposed to light the slower the shutter speed, the longer the time the image sensor is exposed to light. Shutter speed is a measurement of the time the shutter is open, shown in seconds or fractions of a second: 1 s, 1/2 s, 1/4 s … 1/250 s, 1/ 500 s, etc.
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