About Ttl And A-Ttl Autoflash Speedlites - Canon EOS-1Ds Instruction Manual

Standard exposure
index
Current flash
exposure level

About TTL and A-TTL Autoflash Speedlites

•
With TTL and A-TTL autoflash Speedlites (EZ-, E-, EG-, ML-, TL-series) set in the TTL or A-
TTL autoflash mode, the flash will be fired only at full output. If you set the camera's
shooting mode to manual or aperture-priority AE, you can adjust the aperture and fire the
flash at full output. Meanwhile, the Speedlite will remain in the TTL or A-TTL autoflash
mode.
•
When the 550EX is set to C.Fn-03-1, the flash will be fired at full output even in the TTL
autoflash mode.
Flash Photography with Speedlite 550EX
Set the correct flash exposure level.
5
•
Adjust the Speedlite's manual flash output and the
camera aperture so that the flash exposure level
indicator is aligned with the standard exposure
index.
Compose and take the picture.
6
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