Nikon D300S User Manual page 141

3
Choose a shutter speed.
While the exposure meters are active,
rotate the main command dial until
"A" appears in the shutter-speed
displays. The exposure indicators do not appear when
"A" is selected.
4
Press the shutter-release button all the way down.
Press the shutter-release button on the camera or remote cord
all the way down. The shutter will remain open while the
shutter-release button is pressed.
5
Release the shutter-release button.
Remove your finger from the shutter-release button to record
the photograph.
Shutter speed: 35 s; aperture: f/25
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