Samsung SP-LFF3CLAX User Manual page 31

2. Move the Projector back and forth to adjust the screen size.
When the screen looks skewed or distorted, use the, Keystone ( (left directional button) Settings Keystone)
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When the screen looks blurry, use the Focus ( (left directional button) Settings Focus) function.
For more information about screen adjustment, refer to "Adjusting the screen by using menu items of the product."
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