&lt;p&gt;To support optimal projector installation and performance in a wide range of environments seven types of optical lens ranging from short-throw to long-throw lens are available with glass materials for better focus and large apertures for a brighter image. The lenses are made in Japan to ensure the highest quality.&lt;br /&gt;&lt;br /&gt;Zoom Ratio: 1.3:1&lt;br /&gt;Throw Ratio: 1.79-2.35 (PX9600)&lt;br /&gt;Throw Ratio: 1.81-2.38 (PW9500)&lt;/p&gt;