Noise Reduction; Af-Assist - Nikon D3100 User Manual

Noise Reduction

Select On to reduce noise (randomly-spaced bright pixels, lines,
or fog), particularly in photographs taken at high ISO
sensitivities or shutter speeds slower than 8 s. The time required
for processing is roughly equal to the current shutter speed;
during processing, "l m" will blink in the viewfinder and
photographs can not be taken. Noise reduction will not be
performed if the camera is turned off before processing is
complete.
If Off is selected, noise reduction will only be performed at high ISO sensitivities; the
amount of noise reduction is less than that performed when On is selected.

AF-Assist

If On is selected and lighting is poor when photographs are
framed in the viewfinder, the built-in AF-assist illuminator
(0 57) will light to assist the focus operation in single-servo AF
(AF-S selected for focus mode, or single-servo AF selected in AF-A
focus mode) when e Auto-area AF is selected for AF-area
mode > Viewfinder or when c Single-point AF,
d Dynamic-area AF, or f 3D-tracking (11 points) is
selected and the center focus point is used. If Off is selected, the
AF-assist illuminator will not light to assist the focus operation. The camera may not
be able to focus using autofocus when lighting is poor.
A
See Also
See page 171 for restrictions on the lenses that can be used with AF assist. See page 186 for
the shooting modes in which the AF-assist illuminator can be used.
i
134
G button ➜ C shooting menu
G button ➜ C shooting menu
AF-assist illuminator