Nikon D810 사용자 설명서

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If On is selected for ISO sensitivity settings > Auto ISO 

sensitivity control in the shooting menu, ISO sensitivity will 
automatically be adjusted if optimal exposure can not be 
achieved at the value selected by the user (ISO sensitivity is 
adjusted appropriately when the flash is used).

Select ISO sensitivity settings in the 
shooting menu, then highlight Auto 

ISO sensitivity control and press 2.

Highlight On and press J (if Off is 
selected, ISO sensitivity will remain 
fixed at the value selected by the 
user).