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Exposure
What is TTL?
TTL (Through-The-Lens) is the standard flash exposure control mode for Speedlites
480EG, 200E, 160E and Macro Ring Lite ML-3 when used with the DCS 500 Series
camera. Additionally, TTL is available with Speedlite 540EZ in all camera exposure
modes except for direct flash in Program mode, as shown in the following table. TTL is
identical to A-TTL in almost every way, except there is no preflash. When the camera is
set to Program mode, TTL flash sets an aperture based on a program line that responds to
the ambient light level.
The availability of A-TTL or TTL depends on the user’s choice of Speedlite, camera
exposure mode, and whether or not the Speedlite is set for direct flash as follows:
Availability of A-TTL and TTL according to Speedlite with DCS 500 Series camera
*Indicates discontinued product as of 1/98.
**When using Speedlite 300TL, set the Flash Mode button to a position other than MHi or
MLo for TTL automatic flash exposure.
Camera Exposure Mode -->
Speedlite Flash Mode
Program Shutter-
priority
Aperture-
priority
Manual
540EZ Direct Flash A-TTL TTL TTL TTL
Bounce Flash TTL TTL TTL TTL
430EZ* Direct Flash A-TTL A-TTL A-TTL TTL
Bounce Flash A-TTL A-TTL A-TTL TTL
420EZ* Direct Flash A-TTL A-TTL A-TTL TTL
Bounce Flash A-TTL A-TTL A-TTL TTL
300EZ* Direct Flash A-TTL A-TTL A-TTL TTL
480EG Direct Flash TTL TTL TTL TTL
Bounce Flash TTL TTL TTL TTL
200E Direct Flash TTL TTL TTL TTL
160E* Direct Flash TTL TTL TTL TTL
ML-3 Direct Flash TTL TTL TTL TTL
300TL** Direct Flash TTL TTL TTL TTL
Bounce Flash TTL TTL TTL TTL
