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The most likely cause of this is that the projector is not positioned with its lens laterally central to the screen. You can prove this by accurately measuring the distance from, say, the top right corner of the screen to the centre of the lens and comparing it to the distance from the top left corner to the lens. The two measurements should be identical.
Even if it is not the cause, the simplest solution is to reposition the projector laterally (by trial and error) such that the image projected has parallel top and bottom, and then adust the mounting tilt to get the top and bottom horizontal.
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Nigel Except on matters of forum moderation, the views expressed in this post are my own, and do not necessarily reflect the opinions of AVForums. |