Quick shift focus is allowing the camera to focus, then with the shutter button still held down half way with your right hand (which also must take the weight of the camera) using your left hand to adjust the focus ring. You can't make it focus, release the shutter button from halfway, adjust focus, then take the photo because it will likely readjust the focus before it takes the photo. I rarely use it, I usually do it when using the DA16-45 at 16mm where focus accuracy is poor, so I set it to the right infinity point then forget about it - good for landscapes.
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