Nikon D3000 Reference Manual

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3
Check the number of exposures 
remaining.
The information display and viewfinder show 
the number of photographs that can be stored 
on the memory card. Check the number of 
exposures remaining.
If there is not enough memory to store 
additional photographs at current settings, a 
warning will be displayed. No further pictures 
can be taken until the memory card has been 
replaced (
0 20) or photographs have been 
deleted (
0 33, 101).
When enough memory remains on the memory 
card to record a thousand or more pictures at 
current settings, the number of exposures 
remaining will be shown in thousands, rounded 
down to the nearest hundred (e.g., if there is 
room for 1,260 exposures, the exposure count 
display will show 1.2 K).
A
Auto Meter Off
At default settings, the viewfinder and information display will turn off if no operations are 
performed for about eight seconds (auto meter off ), reducing the drain on the battery.
 
Press 
the shutter-release button halfway to reactivate the display (
0 29).
The length of time before the exposure meters turn off automatically can be adjusted using 
the Auto off timers option in the setup menu (
0 130).
A
Image Sensor Cleaning
At default settings, the camera vibrates the low-pass filter covering the image sensor to 
remove dust when the camera is turned on or off  (
0 170).
8 s
Exposure meters on
Exposure meters off
Exposure meters on