BenQ GS50 - Correcting Keystone Distortion

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Correcting keystone
The keystone effect refers to the situation where the projected image is noticeably wider at the top / bottom / left / right. It occurs when the projector
is not perpendicular to the screen. To correct the keystone effect press the keystone button on the remote control and then follow the on-screen
instructions to make the adjustments.
When you are done making the adjustments, press to save your changes and return to the previous menu.