Nikon D90 - Manual (Page 99)

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A 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.
(Remember, the larger the f-number, the smaller the aperture.)
Fast shutter speed ( 1 /
1,600
s) Slow shutter speed (1 s)
Small aperture (f/36) Large aperture (f/3)
Control panel
Aperture Shutter speed