Has anyone come across this problem on Canon 7D? I recently did a photo shoot of Prairie Chicken "booming" in WI, and came back with almost all soft images. I used Al Servo mode and high speed continuous drive with tripod mounted 400/f4 lens + 1/4x II TC on a sturdy tripod with IS II on. Images taken with the same setup with IS off, one-shot and single frame modes are sharp as usual. I have noticed this is the case whenever I use the al servo mode. I am wondering if it is due to operator error or a problem with the focusing system in al servo mode. I am wondering if I should send the camera for service. Thanks for your feedback.