183nShooting (All Exposure Modes)The camera takes time to turn on: Delete files or format the memory card.The shutter-release is disabled:• The battery is exhausted (0 12, 21).• The memory card is locked (0 15) or full (0 15, 21).• The camera is not in focus (0 25).• You are currently filming a slow motion movie (0 39).The camera does not focus automatically:• The subject is not suited to autofocus (0 54).• The camera is in manual focus mode (0 52, 55).Focus does not lock when the shutter-release button is pressed halfway: Use the 1(A) button to lock focus when AF-C is selected for focus mode or whenphotographing moving subjects in AF-A mode (0 52, 145).Focus area selection is unavailable: Focus area selection is not available inauto-area (0 144) or face-priority (0 25) AF. In other AF-area modes, thefocus area can be selected by pressing J.Subject-tracking AF not available: Select a non-monochrome Picture Control(0 132, 144).AF-area mode selection is unavailable: The camera is in Smart Photo Selectormode (0 31), manual focus mode is selected (0 52), or h Scene autoselector is selected for Exposure mode (0 111).Image size selection is unavailable: NEF (RAW) is selected for image quality(0 119).The camera is slow to record photos: Turn long exposure noise reduction off(0 140).Noise (bright spots, randomly-spaced bright pixels, fog, or lines) appears in photos:• Lower ISO sensitivity or enable high ISO noise reduction (0 140).• Use long exposure noise reduction at shutter speeds slower than 1 s(0 140).No photo taken when remote control shutter-release button is pressed:• Replace battery in remote control (0 163).• Choose a remote control mode (0 49).• The remote control standby timer has expired (0 156).• The remote is not pointed at the camera or the infrared receiver is notvisible (0 2, 3, 50).• The remote is too far from the camera (0 50).• Bright light is interfering with remote.Smudges appear in photographs: Clean the front and rear lens elements