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CMS-XML Specifications of the 550EX Speedlite.
AF- assist beam emitter blinks Flash Modes ... Power Source Size-AA alkaline LR6 batteries (6 V) x 4; Size-AA Nicad KR 15/51 batteries x 4 Size-AA Lithium FR6 batteries (6 V) x 4 External Power Source ... With the power switch set to SE, the Speedlite enters the SE mode as follows:
CMS-XML 550EX Speedlite : How to turn the Speedlite flash on and off.
Turns off the power Turns on the power Turns on the power and enables the SE (Save Energy) mode turns off the Speedlite automatically after a period of non-use as indicated in the following table.
CMS-XML 550EX Speedlite : Recycling times and number of bursts (flashes).
The Speedlite 550Ex can use any of the following two external power sources. For details, refer to the instructions of the respective external power source.
CMS-XML 550EX Speedlite : How to set the Speedlite for Manual Flash mode.
In the manual flash mode, you can set the flash output from 1/1 (full) to 1/128 power in full-stop increments To prevent overheating and deterioration of the flash head, observe the following limits for continuous shooting with flash: (1) At 1/1 or 1/2 output Max. 15 continuous flash shots