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David, I wish it were the mirrors putting two pixels on the screen by reflecting in different directions, but that's not the way the shift occurs. There is a single optical element "wobulating" the whole image to get the shift. In 1/120 sec the chip's 4 MP projects the first image and the next 1/120 sec they make another complete 4MP image and the optical actuator shifts it diagonally to complete the 8 MP in one refresh interval of 1/60 sec.