Nikon D5100 Reference Manual page 239

Photos are out of focus:
• AF-S or AF-I lens is not attached: use AF-S or AF-I lens or focus manually.
• Camera unable to focus using autofocus (0 40): use manual focus or focus lock (0 44, 45).
• Camera is in manual focus mode: focus manually (0 45).
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 44).
Can not select focus point:
• e (Auto-area AF; 0 42) is selected: choose another AF-area mode.
• Press shutter-release button halfway to turn monitor off or activate exposure meters (0 28).
Subject-tracking AF not available: Select a non-monochrome Picture Control (0 91).
Can not select AF-area mode: Manual focus selected (0 39, 100).
Image size can not be changed: NEF (RAW) option selected for image quality (0 48).
Camera is slow to record photos: Turn long exposure noise reduction off (0 154).
Noise (randomly-spaced bright pixels, fog, or lines) appear in photos:
• Choose lower ISO sensitivity or turn high ISO noise reduction on (0 154). Choose lower ISO sensitivity or turn high ISO noise reduction on Choose lower ISO sensitivity or turn high ISO noise reduction on (
• Shutter speed is slower than 1 s: use long exposure noise reduction (0 154). Shutter speed is slower than 1 s: use long exposure noise reduction ( Shutter speed is slower than 1 s: use long exposure noise reduction (
No photo taken when remote control shutter-release button is pressed No photo taken when remote control shutter-release button is No photo taken when remote control shutter-release button is pressed:
• Replace battery in remote control (0 207).
• Choose remote control release mode (0 35).
• Flash is charging (0 28).
• Time selected for Custom Setting c4 (Remote on duration, 0 161) has elapsed: press
camera shutter-release button halfway. camera shutter-release button halfway. camera shutter-release button halfway.
• Bright light is interfering with remote. Bright light is interfering with remote. Bright light is interfering with remote.
Beep does not sound:
• Off is selected for Custom Setting d1 (Beep; 0 161). is selected for Custom Setting d1 ( is selected for Custom Setting d1 (
• Camera is in quiet shutter-release mode (0 35) or movie is being recorded (0 107). Camera is in quiet shutter-release mode ( Camera is in quiet shutter-release mode (
• MF or AF-C is selected as the focus mode or subject moves when AF-A is selected (0 39). is selected as the focus mode or subject moves when is selected as the focus mode or subject moves when
Smudges appear in photographs: Clean front and rear lens elements. If problem persists, perform photographs: Clean front and rear lens elements.
Smudges appear in Smudges appear in photographs
image sensor cleaning ( image sensor cleaning (0 210). image sensor cleaning
Date is not imprinted on photos: An NEF (RAW) option is selected for image quality (0 48).
Sound is not recorded with movies: Microphone off is selected for Movie settings > Microphone
(0 109).
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 (0 170).
Menu item can not be selected: Some options are not available in all modes.
: Turn long exposure noise reduction off : Turn long exposure noise reduction off (
35). 35).
Remote on duration Remote on duration
: Clean front and rear lens elements.
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(0 0 154). 154).
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