Nikon F3AF instruction manual Setting the Aperture, Setting the Shutter Speed

-EXPOSURE-continued---------------

Setting the Aperture

The second factor in determining exposure is the shooting aper- ture. Aperture, or the opening formed by the diaphragm inside the lens, controls the amount of light allowed to pass through the lens and strike the film ; it also controls depth of field (see page 36 for more information). In low light, you are generally required to use large apertures (indicated by f-numbers which are low in numerical value, e.g. f/2.8), while in bright light, small apertures are called for (e .g., f/16) . The aperture ring @ features click-stops at whole fIs tops but is continuously variable through- out its entire range. With the exception of a few special lenses, Nikkor and Nikon Series E lenses enable full-aperture light measurement regardless of the aperture setting . These lenses have automatic diaphragms, meaning that the diaphragm stops down to the preset aperture only at the instant of exposure. To keep you fully informed, the aperture in use appears in the ADR window CD inside the camera'sviewfinder.

Setting the Shutter Speed

Shutter speed, or the length of time the shutter remains open , also determines the amount of light allowed to strike the film. The Nikon F3AF offers automatic stepless shutter speed control over the range from 1/2000 sec. to 8 sec. , plus full manual con - trol with a choice of 18 settings, including B, T, and X. All shutter speeds, except T, are electromagnetically controlled.

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