Hello,


Just brought the 7D and have a question about the wireless flash. I use it as a master and the 580EXII as a slave. When I fire it the popup flash fires and then the slave. I am just wondering if this effects the exposure of the pictures taken at all. I'm thinking that the popup flash that fires from teh 7D does not effect the exposure but I am jsut wondering why it fires..


any thoughts?





Thanks!