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10. So how does Shutter Speed affect the light in my picture? So now we know that the shutter opens and closes in front of the film or sensor to determine how long light is allowed to fall on the light-sensitive medium. If we reduce the shutter speed to some small value, say, 1/1000th of a second, then light will only be hitting the sensor for 1/1000th of a second. Inversely, if we increase the shutter speed to some larger value, say 1/10th of a second, or even a second or more, then light is allowed to hit the sensor for a much longer period of time. Light emitted or reflected from an object is constantly streaming from that object, at the speed of light naturally, to the camera. So any movement of the subject that happens while the shutter is open will be recorded. Probably you’ve seen pictures in which a waterfall appears to be flowing, or clouds streaming by, or maybe car tail-lights that stream by in one continuous line; all results of a long shutter speed setting. Inversely, you’ve probably also seen photos that seem to freeze action dead in its tracks. Such as blobs splashing water. This frozen action is a result of a very short shutter speed, as only the light reflecting from the object during that hundredth or thousandth of a second that the shutter was open will be record. A note should be made here that long shutter speeds, as discussed above, will capture all movement of the subject during the period for with the shutter is open. That being said, any movement of the camera itself while the shutter is open will influence the shot as well. So when using a longer shutter speed, it would be recommended that you use a steady tripod to avoid the potential of camera shake, which can make the final pictures blurry. Unfortunately, the effects of camera shake are exaggerated by longer focal lengths. Just as if you were wagging a broom stick up and down, the longer the stick, the larger the physical distance the opposite end of the stick travels when wagged. Some photographers use a very simple rule to determine what shutter speed is preferred at certain focal lengths in order to avoid the potential for camera shake. They simply invert the focal length. For instance, if your lens is shooting at 200mm, then you’d need a shutter speed of 1/200 seconds to help eliminate the chance for camera shake. Many professional lens use technology to great effect as well to reduce camera shake, such as Canon lenses with Image Stabilization technology. As an example, the picture below was taken at a fountain in front of the Paris Hotel and Casio in Las Vegas, Nevada. The statue, standing on the edge of the fountain was framed by splashing water. I wanted to freeze the action of the scene completely in an attempt to give the statue some essence of life, as if it were frozen in the moment just like the water and could come to life as the water would after the picture was completed. To achieve this, we set a very fast shutter speed to help freeze the action.
ISO 100, 59mm, F/5.6, 1/500 sec
Inversely, the broader scene of the fountain lent itself readily to a longer shutter speed that would capture the beautiful, flowing motion of the fountain's various waterfalls and sprays.
ISO 100, 18mm, F/22, 1/20 sec
So the shutter speed, like the aperture, not only serves as an essential tool for manipulating exposure, but also a powerful tool for adding an artistic element to you photos. <<PREV 1 2 3 4 5 6 7 8 9 10 11 12 13 NEXT>>
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