An average flash unit rating of around 60 joules.

平均估计,一般的闪光单元约为60焦耳.

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Incidentally , this also works with the built - in flash unit on all Canon DSLR's!

所有佳能数码单 反 的内置闪光灯也有闪光曝光锁功能.

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Set the flash unit to auto mode and set the shutter speed below 1 90.

将闪光装置设置为自动模式并将快门速度调到慢于1\90.

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