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.
互联网
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.
互联网
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.
互联网