Sony DSLR-A900 User Manual

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Manual shift
You can change the shutter speed and aperture value combination without 
changing the exposure you set.
Rotate the front control dial while 
pressing the AEL button to select the 
shutter speed and aperture value 
combination.
AEL button
 Shooting with BULB
You can shoot trails of light, such as 
fireworks, with a long exposure.
1
Set the mode dial to M.
2
Rotate the front control dial to the 
left until [BULB] is indicated.
BULB
3
Rotate the rear control dial to adjust the aperture (F-number).