Nikon D610 - Manual (Page 106)

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3
Choose a shutter speed.
While the exposure meters are on, rotate the
main command dial to choose a shutter
speed of
A.
For a shutter speed of “time” ( %), select
remote control release mode ( 0 85) after
choosing the shutter speed.
4
Open the shutter.
Bulb : After focusing, press the shutter-release button on the camera or optional
remote cord all the way down. Keep the shutter-release button pressed until
the exposure is complete.
Time : Press the ML-L3 shutter-release button all the way down.
5
Close the shutter.
Bulb : Take your finger off the shutter-release button.
Time : Press the ML-L3 shutter-release button all the way down. Shooting ends
automatically after thirty minutes.
Main command dial