2. External Power Sources
Speedlite 550EX can use any of the following two external power sources. For details, refer to the Instructions of the respective external power source.
(1)Transistor Pack E
Uses Canon Battery Magazine TP (six
(2)Compact Battery Pack
Uses six
Recharging Time and Available Flashes
| Power Source | Recharging Time (sec.) | Available Flashes | ||
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| Quick Flash | Normal Flash |
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Internal | Approx. 0.1 - 4 | Approx. 0.1 - 8 | Approx. 100 - 700 | ||
Power | |||||
Sources |
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| Transistor Pack E | Approx. 0.1 - 1.5 | Approx. 0.1 - 3 | Approx. 300 - 1800 | |
External |
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Transistor Pack E | Approx. 0.1 - 2 | Approx. 0.1 - 5 | Approx. 350 - 2200 | ||
Power | |||||
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Sources |
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Compact Battery Pack | Approx. 0.1 - 1.5 | Approx. 0.1 - 5 | Approx. 350 - 2200 | ||
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•While
•Even when an external power source is used, batteries must be installed in the 550EX to power the internal circuitry.
•The 550EX uses both the internal and external power sources to recharge the flash. Therefore, the internal power source may become exhausted sooner than the external power source. For prolonged flash photography, keep a spare set of batteries handy for the internal power source.
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