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Reference—Exposure
Exposure Mode
Exposure mode determines how the camera sets shutter speed and aperture
when adjusting exposure. Four modes are available: programmed auto (P), shut-
ter-priority auto (S), aperture-priority auto (A), and manual (M).
To preview the eff ects of aperture, press and hold the
depth-of-fi eld preview button. The lens will be stopped
down to the aperture value se lect ed by the cam era
(modes P and S) or the val ue cho sen by the user (modes
A and M), al low ing depth of fi eld to be previewed in the
viewfi nder (the built-in fl ash and optional SB-800, SB-600,
and SB-R200 Speedlights will emit a modeling fl ash).
Depth-of-Field Preview
CPU Lenses
When using a CPU lens equipped with an aperture ring, lock the aperture ring at the min-
i mum aperture (highest f/-number). At other settings, the shutter release will be dis abled
and a blinking will appear in the aperture displays in the control panel and viewfi nder.
Type G lenses are not equipped with an aperture ring.
b1—ISO Auto ( 152)
When Custom Setting b1 (ISO Auto) is on, the camera automatically varies ISO sensitivity
between ISO 100 and a maximum selected by the user to help ensure optimum ex po sure
and fl ash level. In exposure modes P and A, the camera adjusts ISO sensitivity when the
shutter speed needed to obtain optimum exposure would be faster than / s or slower
than a specifi ed value. Otherwise the camera adjusts ISO sensitivity when the limits of the
camera exposure metering system are exceeded (mode S) or when optimum exposure can
not be achieved at the shutter-speed and aperture selected by the user (mode M).
e4—Modeling Flash ( 166)
If Off is selected for Custom Setting e4 (Modeling Flash), the built-in fl ash and optional
SB-800, SB-600, and SB-R200 Nikon Speedlights will not emit a modeling fl ash when the
depth-of-fi eld preview button is pressed.