Kodak DCS500 - Manual (Page 199)

10-10
3 (Optional) To lock in exposure,
follow these steps.
a Focus the subject by holding
down the Focusing Point
Selector button and turning
the Main dial.
The currently selected
focusing point lights red in
the viewfinder and the
focusing point indicator
appears in the Top LCD
panel.
b Press the Vertical AE Lock
button.
c Refocus the subject and
change the composition as
desired.