Nikon D3100 Reference Manual page 205

D3100 user's manual
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Focus does not lock when shutter-release button is pressed halfway: Use AE-L/AF-L button to lock focus
when live view is off and AF-C is selected for focus mode or when photographing moving
subjects in AF-A mode (0 60).
Can not select focus point:
• e Auto-area AF selected for AF-area mode > Viewfinder (0 58), or Face-priority AF
selected for AF-area mode > Live view/movie (0 38): choose another mode.
• Press shutter-release button halfway to turn monitor off or activate exposure meters (0 27).
Subject-tracking AF not available: Select a non-monochrome Picture Control (0 94).
Can not select AF-area mode: Manual focus selected (0 38, 55).
Image size can not be changed: Image quality set to NEF (RAW) or NEF (RAW) + JPEG fine (0 65).
Camera is slow to record photos: Turn noise reduction off (0 134).
Noise (randomly-spaced bright pixels, fog, or lines) appear in photos:
• Choose lower ISO sensitivity or turn noise reduction on (0 134).
• Shutter speed is slower than 8 s: use noise reduction (0 134).
Smudges appear in photographs: Clean front and rear lens elements. If problem persists, perform
image sensor cleaning (0 180).
Date is not imprinted on photos: Image quality set to NEF (RAW) or NEF (RAW) + JPEG fine (0 65,
147).
Sound is not recorded with movies: Off is selected for Movie settings > Sound (0 47).
Flicker or banding appears during live view or movie recording: Choose an option for Flicker reduction
that matches the frequency of the local AC power supply (0 139).
Menu item can not be selected: Some options are not available in all modes.
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189

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