Sony DSLR-A900 User Guide

For details, see page 66.

You can select the flash control mode to set the amount of flash light.

ADI: Advanced Distance Integration
TTL: Through the lens

• When [ADI flash] is selected, using a lens that is provided with a distance 

encoder feature can perform more accurate flash compensation by using 
more accurate distance information.

Notes
• When the distance between the subject and the flash cannot be determined (wireless 

flash shooting, shooting with an off-camera flash using a cable, shooting with a 
macro twin flash, etc.), the camera automatically selects Pre-flash TTL mode.

• Select [Pre-flash TTL] in the following cases, as the camera cannot perform flash 

compensations with ADI flash.
– A wide panel is attached to the HVL-F36AM flash.
– A diffuser is used for flash shooting.
– A filter with an exposure factor, such as an ND filter, is used.
– A close-up lens is used.

• ADI flash is only available in combination with a lens that is provided with a 

distance encoder. To determine if the lens is equipped with a distance encoder, refer 
to the operating instructions supplied with the lens.

Flash mode

Flash control

This method controls the lighting of the flash, factoring in the 
focus distance information and light metering data from the 
pre-flash. This method enables an accurate flash 
compensation with virtually no effect from the reflection off 
the subject.

This method controls the amount of flash light depending on 
the data only from pre-flash light metering. This method is 
susceptible to the reflection off the subject.