"I went through London Gatwick with Provia 400 exposed at 800 in the carry-on a few weeks back. 4 rolls went through the carry-on x-ray, and were ruined, the one roll I kept in my pant-pocket (which then didn't get x-ray) was fine. The film came out of the same pack and had been stored and exposed identically."
Hmmm. This is troubling. Provia 400F has the least exposure latitute of any film I have used, especially for overexposure. If you are more than 1/4 to 1/3 stop overexposed, you will not have a good image. Perhaps its sensitivity increases when it is exposed at 800 and pushed a stop. I haven't tried this, but can say that I've never had a problem. Still, it is possible that the machines can affect a film as sensitive as this.
Joe
