De AVSForum...
It is reported to have Optoma's infamous 32% offset, which means that it must be mounted 32% of the screen height above or below the screen. A 106" diagonal screen is 52" tall, so the center of the lens will need to be 16.64" above the viewing surface for a ceiling mount. If you could mount the PJ tight to the ceiling, that would put the lens at approximately 5". Add the 16.64 to get 21.64" below the ceiling, and that's where you would mount your screen. You have 86" to work with. 86"-22"(21.64)=64". Now your screen is 52" high (excluding the border), so the bottom of your screen would be 64"-52" or 12" off the floor. Thats much too low.
I am holding the brochure in my hand. Unless they are going to make changes before shipping, there is no lens shift on the Optoma HD72...


www.optomausa.com/Product_detail.asp?product_id=249