> When photographing events where other people are popping their flashes, you need to cover the Wein Slave with > your hand when not shooting. Otherwise, every time someone pops their flash, yours will go off too, draining the battery. On the other hand I was at a wedding once where the 'professional' photographer used visible light slaves and everytime I or anyone else with a decent flash took a photo, we got full use of the all the pro photographer's strobes. Greg