AVS Addicted Member
Join Date: Dec 2000
Location: brookeville, maryland, usa
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No you won't. The opening is irrelevant. You must mount the screen so that the frame lies in one plane. No bulges in the frame etc. The larger the frame, the more likely it won't lie completerly flat. You must shim it to make it completerly flat. Not just flat to you but say within 1/8 or so of an inch. put a level on the top of the frame and make sure it is level just like you put a level on the top opening of your cut out.
That's it. All other adjustments are done with the projector mount and be sure to use a pole, no matter how short so you can rotate the projector right left. Critical to getting the image square. Do not rotate to center the image. Under no conditions do this. Either add a lens shift bracket to your mount, remount if needed, or use a click or so of horizontal lens shift. You should have no problems. Thr up down tilt will equalize the disparity in top and bottom edge lemgths and the rotation around the pole will equalize the disparity in side edge lengths. The left right tilt adjustment will msake the top edge track the top inside edge of the frame. Good luck.
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