Originally Posted by prince.nothing
Hey friends, what's the best way to make the ceiling projector image fit the screen? Last time around I spent a lot of time getting it just right (by hit and trial), and I want to do it the right way now that my screen is being replaced. Thanks.
Start with mounting the screen level and plumb on the wall - take your time and ensure it is done correctly. If you are hanging it with brackets, use a level and a straightedge as needed to make sure the mounting points are level. After mounting, check level across the top of the screen and down the face (on each side) to ensure that the entire screen face is both horizontally level and vertically plumb.
Mount the projector so the lens is centered as best you can with the screens horizontal mid point. Use a level to ensure the projector is level front to back and side to side. Turn on the projector and use the vertical shift control to shift the image down until it is vertically centered in the screen. Use the horizontal shift to center the image horizontally on the screen (this should be minimal). Use the zoom and focus controls if necessary to make the projection sharp and slightly smaller that the screen size so you can visually assess how square and plumb both the screen and projector are - if you were careful with the screen and projector mounting, adjustments should be minimal if needed at all.
Both image sides should be of equal length vertically on the screen . If they are not, rotate the projector to move the lens slightly left or right until they are. Re-center the image on the screen with the horizontal shift. Do NOT tilt the projector up or down (either side to side, or front to back) while doing this adjustment.
Both image top and bottom should be of equal length horizontally on the screen. If they are not, tilt the projector slightly up or down (front to back) until they are. Re-center the image on the screen with the vertical shift. Do NOT rotate the projector left or right, or tilt the projector side to side.
When done, you should have a perfect rectangle projected on the screen, with equal length sides, and equal length top and bottom.
If the rectangle is tilted relative to the screen (and the screen is level) the projector is not level. Correct it by tilting the projector slightly side to side. Do NOT rotate the projector left or right, or tilt the projector front to back.
When done, you should have a perfect rectangle on the screen, which is vertically and horizontally aligned with the screen border masking. Ensure the projector mount is locked down and do not physically move it further. Recheck the image after tightening to ensure it has not shifted.
Use the lens zoom, focus, vertical and horizontal shifts to get the image centered, focused and very slightly overlapping the black masking at the edge of the visible screen area. If your screen aspect ratio is matched to the projector (assuming you are going with a conventional 16:9 screen), you should have approximately the same small overlap on all four sides. If you have a slightly different aspect ratio, you will simply have to zoom a little more until the entire image area is covered - you cannot change the aspect ratio of the projector panels.
Take your time and make sure you get it set up right - have fun and enjoy the show ...