Canon EOS 50E - Manual (Page 82)

VII. E-TTL Auto Flash System with Canon
Speedlite 380EX
With Canon Speedlite 380EX, you can use the new E-TTL (Evaluative-
Through-The-Lens) auto flash system which enables FP (Focal-Plane)
flash for high-speed sync and synchronization with all shutter speeds and
FE (flash exposure) lock.
When using Speedlite 380EX, refer to the Speedlite’s Instructions.
E-TTL Auto Flash System Features
Unlike the A-TTL and TTL auto flash
systems which used a multiple-zone
flash metering sensor to control the
flash exposure, the E-TTL auto flash
system uses the camera’s metering
sensor for normal evaluative metering
and controls the flash exposure
automatically.
The E-TTL auto flash system thereby
controls the flash exposure with higher precision and boosts the
performance of the AIM system (which links the metering and flash
exposure to the focusing point).
The E-TTL auto flash system controls the exposure of the main subject as
well as the background. It combines normal automatic exposure control
and flash exposure control for both fill-in flash and low-light conditions. It
also enables high-speed sync (FP flash) and FE lock.
The basic operation when the camera is used with Speedlite 380EX is
described here. For details, refer to Speedlite 380EX’s Instructions.
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