This motorized short zoom A20 lens from Optoma is intended for their WU1500 projector and has a throw ratio (distance/width) of 1.2 ~ 1.5. Optoma BX-CTA20 Lens Specifications: Model Name: A20 Lens Name: Short Zoom Throw Ratio: 1.2 ~ 1.5 Zoom Ratio: 1.25x F number: 2.2 Focal Length: 25.5 ~ 31.8mm Zoom and Focus Adjustment: Motorized zoom and focus Throw Distance: 1.3m ~ 16.2m Projected Image Size: 50°-500° diagonal Motorized Lens Shift: Vertical: +/-60% offset Horizontal: +/- 25% offset Brightness Ratio: 95% Optoma BX-CTA20 1.2 – 1.5:1 Motorized Semi Wide Throw Zoom Lens.