Sony DSLR-A900 User Guide

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You can compensate the exposure with the front control dial (
) or rear 
control dial (
).
For example, when [Ctrl dial setup] is set to [
SS 
F/no.], the 
functions of the front and rear control dials are as follows:
When the exposure value is not displayed, you can lock the front and rear 
control dials to deactivate them.
Dial exp.comp
Off
Does not compensate the exposure with the dials.
 Front dial
Compensates the exposure with the front control dial.
 Rear dial
Compensates the exposure with the rear control dial.
Exposure Mode
Off
 Front dial
 Rear dial
P
Front control dial
P
S
 shift
Exp. comp
P
S
 shift
Rear control dial
P
A
 shift
P
A
 shift
Exp. comp
A
Front control dial
Aperture
Exp. comp
Aperture
Rear control dial
Aperture
Aperture
Exp. comp
S
Front control dial
Shutter speed
Exp. comp
Shutter speed
Rear control dial
Shutter speed
Shutter speed
Exp. comp
M
Front control dial
Shutter speed
Shutter speed
Shutter speed
Rear control dial
Aperture
Aperture
Aperture
Ctrl dial lock
On
The front and rear control dial function only when the shutter 
speed and the aperture are displayed.
Off
The front and rear control dial function at all times.