Nikon D7100 - Manual (Page 357)

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Photos are out of focus :
• Rotate focus-mode selector to AF (0 71).
• Camera unable to focus using autofocus: use manual focus or focus lock (0 76, 78).
• The shutter-release button can not be used to focus when AF-ON is assigned as the Press
option for Custom Setting f2 (Assign Fn button, 0 253), f3 (Assign preview button,
0 255), f4 (Assign AE-L/AF-L button, 0 256), or f9 (Assign MB-D15 4 button, 0 259). Use
the button to which AF-ON is assigned.
Focus does not lock when shutter-release button is pressed halfway : Use A AE-L/AF-L button to lock focus
when AF-C is selected for autofocus mode or when photographing moving subjects in AF-A
mode.
Can not select focus point :
• Unlock focus selector lock (0 75).
• Auto-area AF or face-priority AF selected for AF-area mode: choose another mode.
• Camera is in playback mode (0 185) or menus are in use (0 217).
• Press shutter-release button halfway to turn monitor off or start standby timer (0 38).
Can not select AF-area mode : Manual focus selected (0 78, 159).
Only one shot taken each time shutter-release button is pressed in continuous release mode : Continuous
shooting is not available if built-in flash fires (0 121).
Image size can not be changed : Image quality set to NEF (RAW) (0 67).
Camera is slow to record photos : Turn long exposure noise reduction off (0 228).
Noise (bright spots, randomly-spaced bright pixels, fog, or lines) appear in photos :
• Choose lower ISO sensitivity or use high ISO noise reduction (0 79, 228).
• Shutter speed is slower than 1 s: use long exposure noise reduction (0 228).
• Turn Active D-Lighting off to avoid heightening the effects of noise (0 113).
AF-assist illuminator does not light :
• AF-assist lamp does not light if AF-C is selected for autofocus mode (0 71) or if continuous-
servo autofocus is selected when the camera is in AF-A mode. Choose AF-S. If single-point or
dynamic-area AF is selected for AF-area mode, select center focus point (0 73, 75).
• The camera is currently in live view or a movie is being recorded.
• Off selected for Custom Setting a7 (Built-in AF-assist illuminator) (0 233).
• Illuminator has turned off automatically. Illuminator may become hot with continued use;
wait for lamp to cool down.
Smudges appear in photographs : Clean front and rear lens elements. If problem persists, perform
image sensor cleaning (0 313).
Sound is not recorded with movies : Microphone off is selected for Movie settings > Microphone.
The brightness of the image in the monitor differs from the exposure of photographs taken in live view :
• Center-weighted or spot metering is selected (0 83).
• The camera is in mode M.
• The subject is too bright or too dark.
• Active D-Lighting is in effect (0 113).
• The photograph is a long time-exposure (0 52).
• The flash is used (0 119).