Optoma Ultra Short Throw 3D 1080p Projector (EH320UST)Optomas 1080p ultra short throw projector, the EH320UST, is perfect for businesses, schools and colleges. It is bright (4,000 Lumens) and a throw ratio of 0. 25: 1 means that it can project a 100 image from just 55cm away. And having the projector installed so close to the screen avoids any shadows being cast across the screen from the presenter(s). It provides a complete package for engaging learning with many new features, including two HDMI inputs,