Nikon D300 User Manual (en)

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The Command Dials
The main- and sub-command dials are used alone or in 
combination with other controls to adjust a variety of settings.
I button
Exposure 
mode
E button
Exposure 
compensation
QUAL
 button
Image
quality/size
ISO
 button
ISO
sensitivity
WB
 button
White
balance
M button
Flash mode/
Flash
compensation
Fn
 button
Bracketing
Sub-command dial
Main command dial