Epson PowerLite Presenter L User Manual page 23

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If the image is horizontally tilted, you can turn the feet to level it.
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Your projector automatically detects the vertical tilt and corrects the image shape. If you
find that the image is not rectangular, however, use the
control or the Keystone setting in the Signal menu (see page 48) to adjust the image
shape.
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Use the setting in the Signal menu to adjust the image size. See page 48.
Zoom
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Rotate the focus ring to sharpen the picture.
buttons on the remote
Keystone
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Playing discs