Kodak DCS 500 Series User Manual page 166

Using Flash Exposure Lock (FE Lock) with an EX-series Speedlite
1
Turn on the camera's Main switch, then turn on the flash.
2
Verify that the flash ready light is illuminated in red (indicating a full charge).
3
Set the camera to Program mode (P) for fully automatic exposure.
4
Focus the subject by pressing the Shutter button halfway down. Keep pressing the
Shutter button halfway even after focus is achieved.
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