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5.7.3 Nikon i-TTL flash mode
i-TTL flash mode is an advanced variant of the standard TTL
flash control of analog cameras. When shooting a picture,
several weakly visible preflashes are fired by the flash unit
prior to exposure. The camera then evaluates the reflected
preflash light so that the subsequent flash exposure is opti-
mally adapted to the prevailing photographic situation.
When the TTL flash mode is selected, the flash unit automati-
cally activates standard TTL or i-TTL flash mode, depending
on the type of camera.
Flash exposure memory
Some cameras have flash exposure memory (FV memory).
This is supported by the flash unit in i-TTL flash mode. It can
be used to define and store the exposure level for the subse-
quent shot before the shot is actually taken. This can be use-
ful when, for example, the flash exposure has to be adjusted
to specific details that may not necessarily be identical with
the main subject.
This function is activated on the camera, in some instances as
an individual function.
5.7.4 TTL flash mode with measurement pre-flash
function (Olympus)
During the shot and before the actual exposure, one or more
pre-flashes are executed by the flash unit. The camera evalu-
ates the measurement pre-flash and controls the light output
of the flash unit for the main flash.
The flash unit is set to this mode by the camera automatically.
5.7.5 P-TTL flash mode (Pentax)
With P-TTL flash mode a measuring pre-flash is fired before
the actual exposure. The camera evaluates the measure-
ment pre-flash and controls the light output for the main
flash.
The flash unit is set to this mode by the camera automatically.
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