Canon 1Ds Instruction Manual - Page 111
Modeling Flash, Wireless, Multi-Speedlite System
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Flash Photography with Speedlite 550EX Modeling Flash By firing a modeling flash, you can see the shadows and other flash lighting effects produced by one or more Speedlites. 1 Make sure the camera and Speedlite are properly set for flash photography. 2 Press the camera's depth-of-field preview button. s The Speedlite 550EX fires at 70 Hz for 1 second. 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. 6 Flash Photography 111
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