I just picked up a Promaster 7500DX for my A100 today. I've got the flash working fine when it's on camera, but I'm having trouble getting it to sync properly in wireless mode. This is my first flash so there might be something I'm missing. The 7500DX fires in wireless mode, but it appears to be firing before the camera begins the exposure. Any ideas? If this doesn't work out I may just take it back and get a 56AM instead. I'd like to also be able to use the flash as a hairlight in my future studio setup.