Experiment in VERY High ISO

The Canon 50D Manual informed me that I can set the camera to increase the range of ISO up to 6400 and 12800, within the menu. Perhaps I should have read the manual when I bought the camera several years ago! THis was set for H2 - ISO 12800, and 1/125th at f4. It was grainy, but the noise reduction filter in PS4 seems to have coped with the worst of it...