Nikon D40x D40X User's Manual - Page 51
P, S, A, and M Modes
UPC - 018208094219
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P, S, A, and M Modes P, S, A, and M modes offer control over a variety of advanced settings, including exposure ( 45), white balance, and image optimization. Each of these modes offers a different degree of control over shutter speed and aperture: Mode P Programmed auto ( 40) S Shutter-priority auto ( 41) A Aperture-priority auto ( 42) M Manual ( 43) Description 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. User chooses shutter speed; camera selects aperture for best results. Use to freeze or blur motion. User chooses aperture; camera selects shutter speed for best results. Use to blur background or bring both foreground and background into focus. User controls both shutter speed and aperture. Set shutter speed to "bulb" or "--" for long time-exposures. Lens Aperture Ring When using a CPU lens equipped with an aperture ring, 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 and a variety of other features can not be used ( 97). 10 - ISO Auto ( 76) Use this option to enable auto ISO sensitivity control in P, S, A, and M modes. Shutter Speed and Aperture The same exposure can be achieved with different combinations of shutter speed and aperture, allowing you to freeze or blur motion and control depth of field. The following figure shows how shutter speed and aperture affect exposure. Shutter speed Aperture Fast shutter speed Small aperture (large f-/number) Slow shutter speed Large aperture (small f/-number) Reference: P, S, A, and M Modes 39