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Specifications of the 550EX Speedlite.
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Direct- sync, shoe-mount flash with E-TTL/TTL autoflash control and wireless transmission/reception (E-TTL preflash, AF- assist beam, auto zoom, and bounce flash). Compatible Cameras
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550EX Speedlite : How to set and use wireless flash with three receiver groups.
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With three wireless receiver units, receiver unit A is the main flash, receiver B is the fill flash and receiver unit C is a supplemental flash. Thus, receiver units A and B serve to illuminate the subject for a proper exposure while receiver unit C illuminates the background to eliminate shadows. Even with three receiver units, the E-TTL autoflash system controls the flash to obtain a correct exposure.
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550EX Speedlite :How to setup wireless manual flash with varied flash output.
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You can set a different output for each receiver unit (A, B and C) as follows. 1. On the sender unit, press the <MODE> button and select M 2. Press the <SEL/SET> button and select <RATIO)
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550EX Speedlite : How to set up wireless E-TTL Autoflash with Flash Ratio ON.
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The receiver ID of the receiver unit on the camera's left is A The receiver ID of the receiver unit on the camera's right is B sender flash OFF is set for the sender unit
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550EX Speedlite : How to set the communication channel on the Speedlite.
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To prevent your sender unit from firing another photographer's receiver units, four channels are provided to differentiate your receiver units from unrelated ones. The sender unit and receiver unit(s) in the same wireless flash system must be set to the same channel No.
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550EX Speedlite : How to turn the Master Flash OFF and use just receiver unit(s).
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Make sure the sender unit's pilot lamp is lit and the receiver units are ready Press the pilot lamp to test the wireless transmission Focus the subject and take the picture.
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550EX Speedlite : How to set manual flash or stroboscopic flash with receiver flash units.
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1. As with studio flash units, you can set the receiver units flash output yourself for wireless or manual flash photography 2. For wireless manual flash photography with Wireless Transmitter ST-E2. On a receiver unit with the wireless selector set to <receiver>, press the <MODE> button for at least 2 sec.
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550EX Speedlite : How to prevent the sender unit from firing its flash.
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This setting (sender Flash OFF) prevents the sender unit from firing a flash. It can still transmit wireless signals to trigger the receiver units
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