Originally Posted by humbland
I'm thinking of trying the Sharp XV-Z3000 set up in our family room. I need motorized lens controls. We have cathedral ceilings with a pole drop ceiling mount. I'm having difficulty interpreting the vertical lens shift numbers. How far above the screen top can it be mounted? The throw is 16 feet to a 110 inch diagonal 16 x 9 screen. Do I have to have the projector lens below the top of the screen? If not, how much above the screen top can it be and still shift the image down to fill the screen?
Best I can tell from the manual, you have 50% +/- from the center of the screen (measuring from the center of the lens) so at full shift up or down, the center of the projectors lens can be either level with the top of the screen image or the bottom of the screen image.
I have been playing around with mine today and took some quick measurements while shooting on my wall (I do not have it mounted in my theater room yet). I leveled the projector the best I could using its feet (table mounted) and squared it up with a nearby wall. At 63 inches away from the wall, the lens center can be 2.5 inches above or below the picture.
Calculating that into an angle is just a bit over 2 degrees (2.2 lets say). So 16 feet back that drop is about 7.5 inches below the center of the lens. Not much shift above the image but any little bit helps! Ofcourse these projectors have some error / tolerence in the lens shift range so maybe another unit is closer to 0 degree offset as stated in the manual, or maybe they can all shift about 2 degrees more than documented.
To summarize: Worst case by the books the projector lens center cannot be higher than the top of the picture, my particular unit can do 7.5 inches higher if its 16 feet back.
Hope that helps