I asked this over on photo.net but didn't really get any useful responses ("turn off the E-TTL on the flash"). I'm guessing not many in the Canon forum over there actually use 1V's anymore... I was playing around with my 1V, Vivitar 285HV, and Pocket Wizards last night. This is the first time I've played with this setup. I have experimented some with the 285 + 1V, but never the PW's. Anyway, I noticed every time I took a photo, the flash was triggered twice, once during the exposure and once right after it. I could see the 2nd flash through the viewfinder, so it's right after the mirror goes up. If I take the PW's out of the equation and leave everything set exactly the same, except for mounting the 285 on the 1V, the flash only fires once, as expected. On my other camera (M6) the PW only fires the flash once, so it's probably not the PW's, but the 1V. What gives? Anybody no why the 1V is triggering twice the PW's twice, but not the flash? How do I fix it?