Nikon P3 - Manual (Page 90)

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This option keeps the aperture from shifting when zooming.
This function is available only when the dial mode is set to E.
At slow shutter speeds, “noise” in the form of randomly-spaced, brightly-col-
ored pixels may appear in pictures, particularly in shadowy areas. When you
take pictures under low levels of light, this option reduces noise.
Note on Noise Reduction
When using Continuous mode (P.80) or when AUTO BRACKETING (P.83) is set to Auto brack-
eting or WB bracketing, Noise reduction (P.88) has no effect even if set to On.
Fixed Aperture I
J Off
(default setting)
Aperture changes with the zoom position.
I On
Aperture is kept as close as possible to the f/-number selected by
you or the camera. To prevent the selected f/-number from exceed-
ing the exposure range at the new zoom position, select an aper-
ture from f/5 to f/7.3.
Noise Reduction o
p Off
(default setting)
Turns Noise reduction off.
o On
Noise reduction takes effect at slow shutter speeds which “cause”
noise. When Noise reduction is on, it takes longer to store pictures
in the internal memory or on the memory card.