Hey guys, I purchased a set of Pocketwizards a couple weeks ago and have been doing alot of reading and a little bit of experimenting with them. I'm using a Canon 7D, 580EXII, and Pocketwizards (Mini TT1 and Flex TT5). I'm finding it a little hard to wrap my brain around TTL metering with the flash. I can't seem to get the desired effect when using Av or Tv while using the flash. What has been working for me is going full on manual with the flash and the camera. While the effect is nice, it takes quite a bit of time to dial in all the settings. I've been reading "The Hot Shoe Diaries" by Joe McNally and have really enjoyed the book so far. What confuses me is he is always using TTL metering generally shooting in Av mode. When I'm outside Av seems to work fine, but when I'm inside is where i'm really getting the most troubles. The camera is metering for low light so my exposure is somewhere around 1/8th and the flash also fires. If I set it to manual mode I can usually get around 1/125th while having the flash fire and get close to the same image. Why does the camera want to use such slow shutter speeds if it knows there's going to be a flash?