I bought the 6D and I love it to bits. However, I have to use an external flash. I recently shot the local museum of science and history with an old Sunpak flash and it did OK but it was a lot of work to get a good photo with it. So I ordered a Canon Speedlite 320EX refurbished from B&H. It doesn't seem to be talking to the camera and vice versa. For example, when I try access the flash function settings it tells me the flash is either turned off or it's an incompatible flash. Every flash I take with it is super white, completely washed out. If I increase the shutter speed above 200 the picture starts getting cut off. I've set the aperture all the way up to 18 and it's still completely washed out. I've set the flash exposure compensation from +3 to -3 without effect. I can get better flash photos with the Sunpak. I will say this much about the 320EX, I do like the video light. I'm shooting in manual mode. What am I missing here?