Shutter speed is the length of time light can expose the film. A camera may
have a leaf-type shutter or a focal-plane shutter. The shutter speed is set in
standardized increments. Increasing the shutter speed incrementally lessens
exposure time by half. At the T setting, the shutter opens the frost time
you press the shutter release button and closes the second time you press the
release button. At theB setting, the shutter remains open as long as you
depress the shutter release button.
Figure 4-20 shows standard shutter speed ratios,
Figure 4-20. -Shutter speed increments.
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