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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 up wireless E-TTL Autoflash with Flash Ratio ON.
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With receiver unit A being the main flash and receiver B being the fill flash the flash ration (A:B) between these two receiver units can be set from 8:1 to 1:1 or from 1:1 to 1:8. (Thirteen 1 /2 stop increments.) In terms of stops, the flash ratio can be adjusted from 3 : 1 to 1 : 1 or from 1 : 1 to 1 : 3 .
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550EX Speedlite : How to set and use wireless flash with three receiver groups.
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The flash ratio range for A:B is the same as when only two receiver units are used Flash exposure compensation with receiver unit C can be set up to +/- 3 stops in 1 / 3 or 1 /2 stop increments The receiver ID of the receiver unit on the camera's left is A
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550EX Speedlite : How to turn the Master Flash OFF and use just receiver unit(s).
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The sender unit can also be set for bounce flash With sender flash OFF, you can use one receiver unit as a wireless off-camera Speedlite Any number of receiver units can be used
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550EX Speedlite :How to setup wireless manual flash with varied flash output.
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1 . On the sender unit, press the <MODE> button and select M 2. Press the <SEL/SET> button and select <RATIO) ... 3 . Press the <-> button to select RATIO ON A:B or A:B:C
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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 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 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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