Modeling Flash; Wireless, Multi-Speedlite System - Canon EOS-1Ds Instruction Manual

Modeling Flash

By firing a modeling flash, you can see the shadows and other flash lighting effects produced
by one or more Speedlites.

Wireless, Multi-Speedlite System

Speedlite 550EX has the following three features:
(1) E-TTL autoflash
(2) Slave unit feature
(3) Master unit feature for wireless control of 550EX slave units
By using the above features, you can set up a wireless E-TTL autoflash system with multiple
Speedlite 550EXs.
You can also set a flash output ratio for up to three Speedlites grouped as main and sub
Speedlites to create the desired flash lighting effect.
•
For details, see the 550EX and ST-E2's Instructions booklet.
Flash Photography with Speedlite 550EX
Make sure the camera and Speedlite are
1
properly set for flash photography.
Press the camera's depth-of-field pre-
2
view button.
s The Speedlite 550EX fires at 70 Hz for 1 second.
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