What are the flash metering modes?
The DiMAGE A1 employs three metering modes; ADI (Advanced Distance Integration) flash metering, Preflash-TTL metering and Manual.
The ADI flash metering mode combines distance information from the autofocusing system with information from a pre-flash exposure.
On the other hand, in Preflash -TTL metering mode, the exposure is calculated with a pre-flash only.
Flash emission control is manually selectable in three levels from 1/1, 1/4, 1/8, 1/16.
Pre-flash TTL metering must be used when a diffuser is attached to an external flash or a filter to the lens.
Attachment of those accessories may cause error in distance information necessary for ADI (Advanced Distance Integration) metering due to reduced entering light.
While manual output control is active, pre-flash will not burst.