"Defocus aberration#The blur disk" . "focus" . . "Defocus" . . "Defocus aberration" . "out-of-focus" . "defocused" . "blurred" . "unfocused" . . "blur" . "defocusing" . "Defocus aberration" . "focussing" . "defocus aberration" . "blurring" . "Aberration" . . "defocus" . "blurs" . "out of focus" . . "Out of focus, Out of Frame" . . . "focusing" . .