Nikon D3000 Reference Manual

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Mode M (Manual)
In manual exposure mode, you control both shutter speed and aperture. To take 
photographs in manual exposure mode:
1
Rotate the mode dial to M.
2
Choose aperture and shutter speed.
Checking the exposure indicator (see below), adjust shutter speed and 
aperture. Shutter speed is selected by rotating the command dial: choose from 
values between 30 s and 
1
/
4,000
s or select “bulb” to hold the shutter open 
indefinitely for a long time-exposure (
0 72). Aperture is selected by pressing 
the 
N (E) button and rotating the command dial: choose from values between 
the minimum and maximum for the lens. Shutter speed and aperture are 
shown in the viewfinder and information display.
3
Frame a photograph, focus, and shoot.
Shutter speed
Aperture
Command 
dial
N(E) button
Command 
dial
A
The Exposure Indicator
If a CPU lens is attached and a shutter speed other than “bulb” or “time“ is selected, the 
exposure indicator in the viewfinder and information display shows whether the 
photograph would be under- or over-exposed at current settings. If the limits of the 
exposure metering system are exceeded, the indicator will flash.
Optimal exposure
Underexposed by 
1
/
3
EV
Overexposed by over 2 EV
Mode dial