Nikon D90 User Manual page 99

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Shutter Speed and Aperture
The same exposure can be achieved with different combinations of shutter speed and
aperture. Fast shutter speeds and larger apertures freeze moving objects and soften
background details, while slow shutter speeds and small apertures blur moving objects and
bring out background details.
Shutter speed Aperture
Control panel
t
1
Fast shutter speed ( / s) Slow shutter speed (1 s)
1,600
Small aperture (f/36) Large aperture (f/3)
(Remember, the larger the f-number, the smaller the aperture.)
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