Nikon D3100 2 manual Shutter Speed and Aperture, Mode Description, Lens Aperture Rings

tP, S, A, and M Modes

Shutter Speed and Aperture

P, S, A, and M modes offer different degrees of control over shutter speed and aperture:

	Mode	Description
	Programmed auto	Camera sets shutter speed and aperture for optimal exposure.
P		Recommended for snapshots and in other situations in which
	(0 74)
		there is little time to adjust camera settings.
S	Shutter-priority auto	User chooses shutter speed; camera selects aperture for best
	(0 75)	results. Use to freeze or blur motion.
	Aperture-priority auto	User chooses aperture; camera selects shutter speed for best
A	(0 76)	results. Use to blur background or bring both foreground and
		background into focus.
M	Manual (0 77)	User controls both shutter speed and aperture. Set shutter speed
		to “bulb” for long time-exposures.

DLens Aperture Rings

When using a CPU lens equipped with an aperture ring (0 168), lock the aperture ring at the minimum aperture (highest f-number). Type G lenses are not equipped with an aperture ring.

AShutter 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.

Shutter speed Aperture

Fast shutter speed	Slow shutter speed	Large aperture (f/5.6) Small aperture (f/22)
(1/1,600 s)	(1 s)	(Remember, the higher the f-number, the
		smaller the aperture.)

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