AVS Special Member
Join Date: Jun 2005
Location: Northern, VA - Washington, DC
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The exact drop you need is a math question more than anything else, and you will need a mount which accepts standard 1.5" threaded pipe, such as a Chief Elite mount.
What you want to do is find a good height/location for your screen that makes you comfortable. Generally your eyes should be about a third to halfway up from the bottom of the screen, but sit back in your chairs and find that height that makes you comfortable.
Now, with that in mind, you can measure to find out where the top of your screen is.
From there, measure up 6" or 7" more and that is where the center of the lens should be. Let's say the top of the screen is 6'6" from the floor. That means the center of the lens should be about 7' from the floor. If it's exactly 10' to the ceiling, then you want the center of the lens to be 3' from the ceiling.
Measure the mount stack height when on the projector and down to the center of the lens. This may be about 4" or so, which may mean you need an extension pipe which is 2' 8" long. If the mounting plate at the ceiling has some height to it, then you may need to take that into consideration as well. But, you must break it all down into bits and pieces then add them all up to get your exact number.
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