Optoma UST projector offset

An Optoma UST (Ultra Short Throw) projector's offset is the physical position of the projector relative to the screen, often specified as a percentage of the screen's height. A positive offset (e.g., 115%) means the projector needs to be positioned above the bottom of the screen, requiring it to be mounted higher than the screen itself, while a negative offset places it below. Since UST projectors are designed to sit close to the screen, the offset determines the vertical positioning needed to center the image without tilting the projector or using keystone correction.