Olympus C-730 Ultra Zoom - Manual (Page 231)

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Chapter 11
Glossary of terms (Cont.)
TTL (Through-The-Lens) System
To help adjust exposure, a light
receptor built into the camera
directly measures the light passing
through the lens.
TTL-AUTO
For use with an external flash.
Light emitted by the flash is
measured by the light receptor in
the camera as it passes through
the lens. A signal is then sent to
adjust the external flash's intensity.