Nikon D90 DX D90 User's Manual - Page 98
Shutter Speed and Aperture
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Shutter Speed and Aperture P, S, A, and M modes offer different degrees of control over shutter speed and aperture: Mode Description P Programmed auto (pg. 80) 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. t S Shutter-priority auto (pg. 81) User chooses shutter speed; camera selects aperture for best results. Use to freeze or blur motion. A Aperture-priority auto (pg. 82) User chooses aperture; camera selects shutter speed for best results. Use to blur background or bring both foreground and background into focus. M Manual (pg. 83) User controls both shutter speed and aperture. Set shutter speed to "A" or "&" for long time-exposures. D Lens Aperture Rings When using a CPU lens equipped with an aperture ring (pg. 228), 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 exposure mode M, when aperture can be adjusted manually using the lens aperture ring (in other modes, the shutter-release will be disabled). The camera exposure meter, auto ISO sensitivity control, and variety of other features can not be used (pg. 165). A See also Use the ISO sensitivity auto control option in the shooting menu (pg. 165) to enable auto ISO sensitivity control in P, S, A, and M modes. Custom Setting b1 (EV steps for exposure cntrl.; pg. 177) determines the size of the increments used for setting shutter speed and aperture. Custom Setting f5 (Customize command dials; pg. 201) determines the roles played by the main and sub-command dials in setting shutter speed and aperture. 78