Optoma BX-DL500 Ultra Long Throw Projector LensExtend Your Projection Range with the Optoma BX DL500 Lens The Optoma BX DL500 is a manual, bayonet style ultra long throw lens designed to extend the projection distance of compatible Optoma projectors. This lens allows for flexible installation options in various environments. Specifications: Brand: Optoma Model: BX DL500 Lens Type: Ultra Long Throw Mount Type: Bayonet Throw Ratio (WXGA): 3. 15 5. 3: 1 Throw Ratio (XGA): 3. 1 5. 9: 1 Throw Ratio