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a. Press “Zoom“ keys to adjust the back focus until the screen center (point 5) is clear and sharp.
b. Press “Focus“ keys to adjust the image focus until the screen corners (point 1, 3, 7, and 9) are clear
and sharp.
c. Repeat step a and b to balance the image focus at the center and corners.
Note:
The image focus should be tuned finely as the balance between the back focus and focus is very
subtle. One press on the “Zoom“ or “Focus“ keys can make a big difference on the screen.