Nikon D500 用户手册

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Select exposure mode M.
Press the 

I button and rotate the main command dial until 

 is displayed in the control panel.

Choose a shutter speed.
While the exposure meters are on, 
rotate the main command dial to 
choose a shutter speed of Bulb 
(

A) or Time (%). The exposure 

indicators do not appear when Bulb 
(

A) or Time (%) is selected.

: After focusing, press the shutter-release button on the 

camera or optional remote cord or wireless remote controller 
all the way down. Keep the shutter-release button pressed 
until the exposure is complete.

: Press the shutter-release button all the way down.

I button