LS2ST4 Projector Multiple Lenses for Diverse Application To support optimal projector installation & performance in a wide range of environment, five types of optical lenses ranging from short-throw to long-throw lens are available. The all-glass optical lenses* eliminate chromatic aberration & color flare for the utmost image quality. Users can maximize installation options & projection layout with a quick one-button release. Changing lenses is now simple & secure. * All lenses except LS2ST3 are all-glass optical lenses.