Olympus CAMEDIA C-2040 Zoom Instructions Manual page 128

Setting the flash brightness (Flash intensity control)
4
Press the [OK] button.
The setting is saved and you
exit the menu screen.
5
If the FL-40 external flash is set to "TTL-AUTO" and is used in conjunction
with the built-in flash, the flash intensity is corrected for both flashes at the
same time.
If the FL-40 external flash is set to "MANUAL" and is used in conjunction
with the built-in flash, only the intensity of the built-in flash is corrected.
If you use a fast shutter speed, the flash intensity correction may not be
sufficiently effective.
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