Nikon D3100 - The Command Dial

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The Command Dial
The command dial can be used with other controls to adjust a variety of settings
when shooting information is displayed in the monitor.
Choose a combination of
aperture and shutter speed
(mode P; 0 74).
Mode P Command dial Information display
Choose a shutter speed
(mode S or M; 0 75, 77).
Mode S or M Command dial Information display
Choose an aperture
(mode A; 0 76).
Mode A Command dial
Information display
Choose an
aperture
(mode M;
0 77).
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Mode M E button Command dial Information display
Command dial
M button
Fn button
Mode dial
E button