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Join Date: Dec 2006
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The Zoom function and throw ratio is what determines how big a projector's image is at a given distance. You can make the image smaller/bigger by changing the ZOOM, but it can only go so small.
The smallest image they can produce at 13 feet back is about 120", though this is at the VERY extreme, so you'd have to check this in person (or ask someone their distance in the Acer thread). My suggestion if you don't want to ceiling mount is to find some type of wall mount that can extend itself slightly closer or just rig a board extension over the shelf and scoot the projector up a few inches. You should be able to do 110" at 12' from the lens.
I think the Viewsonic pjd7820hd and the Acer h6510bd are the same basic projector internals except for the light path / lamp and different firmware (and maybe a different lens). I think they are either both manufactured at the same Asian plant or they both used the same DLP kit and schematics to build them out. Why do I think that, well because the throw ratio, color wheel, ZOOM, and the depth of both projectors is EXACTLY the same. Even the width and height are within 0.1" of each other, and the depth is exactly identical. They have a different case but the internals are too closely matched.
These projectors are both 9" deep (8.7" to be exact), and you also need to leave at least about 2" to 4" for the cables. So figure the projector's lens will actually be 13 feet back, not 14 feet back. If you can gain one more foot, you should be fine for a 110" screen. 110" isn't too big, but 120" might be, depends on your taste.
It wouldn't bother me to sit 11 to 12 feet back from a 120" screen, but it might bother some.