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Rotate the focus ring or lens slowly. At the same time, check the focus point
carefully. The best focus point for the lens would be where the image most
clear.
Note: If it is still blurry, please try to adjust the projection distance.
2.Digital 4D Keystone Correction.
Use the digital 4D keystone correction of the projector to change the image to
be rectangle(vertical and horizontal). Detail please refer the page 17 of this
manual.
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