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This table does not necessarily apply when using a lens of a different focal length. If you are using a telephoto lens, for instance, any subject movement and the least bit of camera shake can have a magnified effect on image sharpness. For a telephoto it is necessary to use faster shutter speeds than with a standard lens under the same lighting con- ditions. It is generally said that, for sharp image results in
There are other considerations in the selection of shutter speed. You can usually freeze the action of relatively slowly moving pedestrians or traffic at a shutter speed of 1/250 sec. The same is not necessarily true of a rapidly moving bicycle. Instead of freezing the action, you may want to emphasize it by blurring some part of the picture. For instance, you could blur a moving subject with a relatively slow shutter speed. Or, using a panning technique, turning the upper part of your body to follow the subject's movement, at a relatively slow shutter speed of perhaps 1/30 sec., you can
blur the background to stress the movement. In this last technique, it is best to continue panning as you release the shutter.
The direction of movement should also be considered. A subject moving directly across in front of the camera will be blurred to a greater degree than a subject which is moving diagonally across or is heading straight for or away from the camera and may require faster shutter speeds than you would use considering speed of movement alone.
In fashion photography, a rapid succession of shots at fast shutter speeds, or using a flash while the model continuously changes the pose, helps to capture natural expres- sion.