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The 3M 20- 31.9mm Short Throw Lens is a 1.6x manual zoom and focus lens for the 3M X90 series of LCD projectors. Maximum lens shift is 10:0 and distance to screen width ratio is 47-78" (1.2-2.0 m). Projects onto a 40-350" screen from 3.3 to 46.6' away.