&lt;p&gt;&amp;bull; Approximately 0.8-1.0:1 ratio &lt;br /&gt;&amp;bull; Powered zoom / focus / lens shot&lt;br /&gt;&amp;bull; Remote control set-up&lt;br /&gt;&amp;bull; For PT-EZ770 / PT-EZ580 series projectors&lt;br /&gt;&lt;br /&gt;&lt;b/&gt;Short throw ratio for flexible installation in narrow spaces&lt;/b&gt;&lt;br /&gt;A short throw ratio of approximately 0.8-1.0:1 adds flexibility for installation in narrow spaces. The powered zoom/focus/lens shift features allow convenient setup by remote control. Can be used with the PT-EZ770 series and PT-EZ580 series of panasonic LCD projectors.&lt;br /&gt;&lt;br /&gt;&lt;b/&gt;The ideal short throw lens for highly versatile projection&lt;/b&gt;&lt;br /&gt;Ideal for a wide range of applications the Panasonic ET-ELW22 short throw zoom lens is ideal for a wide range of applications including: Large/medium classrooms Seminar rooms Museum/exhibition halls and Shows.&lt;/p&gt;&lt;table class=features&gt;&lt;thead&gt;&lt;tr&gt;&lt;th colspan=2&gt;Features&lt;/th&gt;&lt;/tr&gt;&lt;/thead&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td class=feature&gt;Lens Throw Ratio&lt;/td&gt;&lt;td&gt;0.8 - 1.0:1  &lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;