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I updated both bodies with no problems. They now feel turbocharged at iso 12,800; locking on and firing noticeably faster. Also had the opportunity to shoot a horribly lit performance at iso 25,600 and was very pleased. Even in a number with almost nothing but tones of brown and blacks, it focused, tracked, and gave me sharp images of the dancers. A couple of times when they began dimming the lights, the AF indicator blinked to indicate it was having trouble, but the images were still in focus. Very impressive.