Since the projector can be placed even with the middle of the screen, without blocking anyone's view, keystoning is not a problem. Some mid-room projectors like the Epson have available 3rd party short throw lenses. Since the image is projected through the screen, the image must be reversed. Reverse Image Reverse image is a feature found on most projectors which flips the image horizontally. When used in a normal forward projection environment text, graphics, etc, are backwards.
Reverse image is used for rear projection.
Road Warriors Those of us who travel frequently, and often need to carry a projector. Once this described the lightest projectors - 10 to 17 pounds, they were the only ones small enough to fit a rolling hard case for cruising through airports, and fitting into the overhead compartment. Those of us who travel frequently, and often need to carry a projector. A case for a projector that has wheels and a pull out handle, so it is ideal for transporting projectors any significant distance. The ability to control your computer's mouse functions remotely.