Sony A900 - Manual (Page 56)

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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).