Longer shutter speeds will allow longer ambient light exposures to help prevent dark backgrounds; however, long exposures also risk blur from subject or camera motion. ... Wireless E-TTL Flash Operation
1. Set up the camera for Integrated Speedlite Transmitter operation. 2. Set up the off-camera Speedlite(s) for wireless control . This QuickGuide will describe both steps.
> lamp does not light after 30 seconds, replace the batteries with new ones. Clean the electrical contacts of the Speedlite and the camera. The bottom of the picture looks dark
