Jul
07
2008
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HariesDesign.com In Photography the length of time that a shutter is open is known as the shutter speed, digital SLR cameras can have a range from 30” to 8000 but this will depend on the mark and type of the camera. The longer the shutter is open, the more light arrives at the sensor. An SLR can have a lowest setting known as the bulb setting, this allows you hold the shutter open as long as you want. The highest setting can be 8000 part of a second ie 1\8000 seconds. Each setting on the dial is known a stop, each change in stop value halves of doubles the exposure time.
Camera shake is a major cause of blurred photographs and is a very common problem in photography especially in those who are new to Photography. Camera shake is related to the speed of shutter. Minor movements of the camera can be amplified by lower shutter speeds, the lower the speed the more the effect is noticed. One rule to follow is never use shutter speed that is smaller than the focal length of the lens, therefore for a focal length of 55 mm you can use a speed of 60 and above. A focal length of 200 mm will require a setting of 1/250 of second. Any shutter speed lower than this will require a tripod. In order to freeze movement a high shutter speed will be required, anything greater than 1\500 will give the subject the impression that it is frozen. At lower shutter speeds (below 1/60) the subject can give the impression that it is flowing. If you move with the subject while you take the picture at lower shutter speeds then the subject will be frozen and the background will be flowing. In order to do this you have to moving at the same speed (or near to) as the subject. This photography technique is known as panning. |
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