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Message: <blockquote data-quote="yauman" data-source="post: 275697" data-attributes="member: 15418"><p>Yes, the firing is a low level light pulse from the camera to communicate with with remote SB910 - it's wireless communication by morse code flashing on/off!!! That's the reason for the system to work you must have a clear line of sight between the camera and the remote SB910!  Look at the left side of the SB910 - you'll see an opening covered with a dark red lens -that's the sensor and must have a line of sight to the camera. That's why also the head can be twisted 180 deg - you'll need to do that if you have to put the light on your right side. Indoors is not much of a problem as enough stray bounced light can reach the sensor but outdoors, especially in the sunlight, triggering is quite problematic.</p></blockquote><p></p>