Quote Originally Posted by HDNitehawk

Rick, this is an interesting shot. I see two different kind of blur here, the motion blur (wing tips) and the out of focus blur. it needs very fast shutter speed to freeze the wing tips of a small bird. I'v been trying to get a good BIF shot of a small bird with the 500mm without any luck. small birds move too fast. your focus point seems on the tree, but the bird's eye looks still in focus, that's pretty good. guess you set up your f stop to around 7.0?( don't think it's because the nice Al Servo AF of your 1D IV,, especially the bird is flying towards you, but what do you think?) what's the shutter speed?