Flash Metering
Flash metering changes according to the lens used.
ADI flash metering
Advanced Distance Integration (ADI) metering is employed when using D
series lenses. ADI metering combines distance information from the autofo-
cusing system with information from a pre-flash exposure. Unlike conventional
TTL flash metering, ADI is not influenced by the reference of the subject or
background ensuring optimum exposures.
Flash Notes
The certain accessories will prevent proper exposure when used with the
camera during flash photography. Do not use filters which alter the required
exposure such as neutral density or polarizing filters. Do not use close-up fil-
ters or lenses on the camera lens, or a close-up diffuser with the flash.
An accessory flash cannot be connected to the camera using a cable. For
more on flash accessory compatibility, see page 56.
49
ADI metering
Conventional TTL metering
Pre-flash TTL
Pre-flash TTL metering is used with non-D series lenses or when a wireless /
remote flash or bounce flash is used. Like ADI metering, Pre-flash TTL com-
pensates for difference in transmission in the optics by measuring the flash
output through the lens, but does not use distance information to calculate the
exposure.
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