Nikon D100 User Manual download pdf (Page 88)

Taking Photographs—Exposure

Exposure

CPU Lenses (All Exposure Modes)

If you are using a CPU lens equipped with an aperture ring, the aperture ring must be

set to the minimum aperture (highest f/-number). At other settings, the shutter release

will be disabled and a blinking will appear in the aperture displays in the control

panel and viewfinder. Type G lenses are not equipped with an aperture ring.

Depth-of-Field Preview (All Exposure Modes)

To get an idea of how your photograph will look at the

current aperture setting, press and hold the depth-of-

field preview button. The lens will be stopped down to

the aperture value selected by the camera in auto multi

program or shutter-priority auto, or the value chosen by the user in aperture-priority

auto or manual exposure mode, allowing you to preview depth of field in the viewfinder.

3—ISO Auto ( 148)

When ON is selected for Custom Setting 3 (ISO Auto), the camera automatically varies

sensitivity in the range 200–1600 (ISO equivalent) to help ensure optimum exposure

when the limits of the camera exposure metering system are exceeded at the sensitivity

selected by the user. In programmed auto, this helps ensure that the correct exposure

can be achieved with subjects that would otherwise be too bright or too dark. In other

exposure modes, it helps ensure correct exposure at the shutter speed and/or aperture

selected by the user. When sensitivity is altered from the value selected by the user, the

viewfinder exposure-mode indicator (P, S, A, or M) will flash and the sensitivity indica-

tor in the viewfinder (ISO) will be displayed in red. In the camera photo information

display for pictures taken at altered sensitivities, the ISO value will also be displayed in

red. Note that noise is more likely to appear in photographs taken at higher sensitivi-

ties.

ON can not be selected for ISO Auto when sensitivity is set to or ; similarly,

or can not be selected when ISO Auto is on. If a flash is used when ISO

Auto is on, ISO will be fixed at the value selected by the user.

Exposure Mode

Your choice of exposure mode determines how the camera sets shutter speed

and aperture when adjusting exposure. Four modes are available: auto multi

program (P), shutter-priority auto (S), aperture-priority auto (A), and manual

(M).

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Nikon D100 User Manual Page 88