1.02 - 1.36:1 throw ratio, project images up to 1000" with the BX-CTA19 lens Designed for the Optoma ZU1700, ZU1900, ZU2200 Ultra Bright DuraCore laser projectors 1.33x Motorized Zoom offers added flexibility with professional installations Lens memory saves the lens position to make setup and adjusting between saved presets a breeze. The BX-CTA19 motorized zoom lens is ideal for a variety of rental and permanent install applications, such as within the entertainment or museum sectors. This lens has a throw ratio of 1.02 - 1.36:1 and can produce an image size of 50" up to 1000".