Nikon fe User Manual
Page 28
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Expo'ilire Con f'ol
The amount of light reaching the film plane is deter
mined by a combination of the lens aperture and the
shutter speed. Since the two are interrelated, different
combinations will give the same exposure. A 1-step
change in the shutter speed, or a 1-stop change in the
aperture setting, will either halve or double the expo
sure. For example, a shutter speed of 1/125 second
allows twice as much light to strike the film as a setting
of 1/250 second, and only half as much light as a speed
of 1/60 second; with an aperture setting of f/11, twice as
much light enters the lens at f/8, and half as much at
f/16. With this in mind, it’s easy to see that if a correct
exposure for a scene is 1 /1 25 at f/11, then 1/60 at f/16
or 1 /250 at f/8 will give you exactly the same exposure.
The best combination will depend on the desired results.
Use fast shutter speeds to freeze motion, or slow speeds
to produce deliberate and creative blur. Small apertures
give greater depth of field, while large apertures restrict
sharp focus to the main subject. The creative selection of
both speeds and apertures will greatly enhance your
photography.
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