Nikon D7000 - Manual (Page 87)

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P, S, A, and M Modes
P , S, A, and M modes offer different degrees of control over shutter
speed and aperture:
Mode Description
P
Programmed auto ( 0 68): Camera sets shutter speed and aperture for
optimal exposure. Recommended for snapshots and in other
situations in which there is little time to adjust camera settings.
S
Shutter-priority auto ( 0 69): User chooses shutter speed; camera selects
aperture for best results. Use to freeze or blur motion.
A
Aperture-priority auto ( 0 70): User chooses aperture; camera selects
shutter speed for best results. Use to blur background or bring both
foreground and background into focus.
M
Manual ( 0 71): User controls both shutter speed and aperture. Set
shutter speed to “bulb” or “time” for long time-exposures.
A
Lens Types
When using a CPU lens equipped with an aperture ring ( 0 269), lock the aperture ring at the
minimum aperture (highest f-number). Type G lenses are not equipped with an aperture
ring.
Non-CPU lenses can only be used in modes A (aperture-priority auto) and M (manual), when
aperture can only be adjusted using the lens aperture ring. Selecting any other mode
disables the shutter release.
A
Shutter Speed and Aperture
The same exposure can be achieved with different combinations of shutter speed and
aperture. Fast shutter speeds and large apertures freeze moving objects and soften
background details, while slow shutter speeds and small apertures blur moving objects and
bring out background details.
Fast shutter speed
( 1 /
1,600
s)
Slow shutter speed
(1 s)
Large aperture (f/3) Small aperture (f/36)
(Remember, the higher the f-number, the
smaller the aperture.)
Shutter speed Aperture