SHORT THROW PROJECTORS IN PAKISTAN

Although most multimedia projectors have a built-in zoom lens, an important subcategory is short throw and ultra-short throw. Generally, a throw ratio of less than 1:1 is considered short throw. The most common throw ratios are 0.5:1 and 0.3:1, with the latter fulfilling the distinction of being "ultra-short throw." Short throw projectors almost never have zoom lenses, and in many cases they use a mirror onto which the image is projected first, before being reflected at the screen. They are typically wall rather than ceiling mounted, and are designed to be installed very close to the screen: 18 inches to 2 feet. Short throw projectors are most often used in classrooms, and are ideal for pairing with digital whiteboards. One might be tempted to place a short throw projector further back than the recommended couple of feet, as a way to achieve a very large image in a small space (assuming sufficiently low ambient light levels, of course). This probably won't work, since short throw projectors keystone severely when used outside their recommend throw distance range, and will require some very creative mounting to produce an undistorted image. Because they are meant for smaller screen sizes (8 feet wide or less), short throw projectors normally top out at 3,000 lumens. If you need a brighter projector and have limited space, you will need to look at a fixed installation projector with interchangeable lenses instead.