Kodak DCS 500 Series User Manual page 164

Most of these units feature a built-in AF auxiliary light function that assists autofocus
operation in dark situations.
The 540EZ's AF auxiliary light is designed to work with all five of the focus
points. Other Speedlites' AF auxiliary lights work only with the center focusing
point.
The 480EG does not emit an AF auxiliary light.
The aperture values displayed on the Speedlite's LCD panel and the camera's Top
LCD panel or viewfinder data display may sometimes differ. However, the
exposure will be correct.
The Speedlite's AF auxiliary light functions only in One Shot AF mode.
Using Canon EX-series Speedlites
What is E-TTL?
E-TTL stands for Evaluative Through-The-Lens flash exposure control. It is a new flash
mode that reads through the lens, but not off the focal plane. This method is superior to
A-TTL or TTL flash exposure control with the DCS 500 Series camera, and provides
several extra features such as Flash Exposure Lock (a method of spot metering with flash)
and FP flash mode (the ability to use flash at shutter speeds higher than 1/250 sec.).
Utilizing a preflash fired after the Shutter button has been fully depressed but before the
camera's reflex mirror goes up, E-TTL uses the camera's evaluative metering sensor to
analyze and compare ambient light exposure values with illumination reflected from the
subject by the preflash. This data is used to calculate and store the flash output required for
optimum exposure of the main subject (identified by the AIM system), while maintaining
a subtle balance between foreground and background. E-TTL is Canon's most advanced
flash exposure control system to date, and requires the use of EX-series dedicated
Speedlites such as the 380EX and 220EX in combination with a compatible camera such
as the DCS 500 Series camera. We strongly recommend the use of an EX-series Speedlite
for best results in automatic flash photography with the DCS 500 Series camera.
AIM (Advanced Integrated Multi-point control system) is Canon's original multi-
point autofocusing and metering system which links evaluative metering, spot
metering and flash exposure control to the active focusing point. It enables the user
to concentrate on composition and capture better images more easily without having
to first place the subject at the center for AF lock.
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