Pentax ist *ist Manual - Page 76
Selecting Another Exposure
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74 SELECTING ANOTHER EXPOSURE MODE Effect of Aperture and Shutter Speed A correct exposure is established by a combination of shutter speed and aperture setting according to the subject's brightness. There are many correct combinations of shutter speed and aperture for a particular subject's brightness. Different shutter speed and aperture settings produce different effects. Effect of shutter speed The shutter speed determines the film exposure times, or the length of time that the light is allowed to strike the film. If the subject is moving, the image will be blurred when a slow shutter speed is used. It is possible to enhance the effect of motion, (The movement of a waterfall) by intentionally using a slower shutter speed. Choosing a faster shutter speed will allow the image of a moving subject to be frozen. A faster shutter speed also helps prevent camera shake. Slower shutter speed Faster shutter speed
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