When used with the RoadRunner and Vivid products and the LU77, this lens has a 1.2:1 short throw ratio. If used with the LS+58, LX66 or LX66A, the lens will provide a 1.5:1 short throw ratio. If used with the LW600 projectors, this lens will provide a 1.65:1 ratio. If used with the LW40(U) projectors, this lens will provide a 1.7:1 ratio.
Please refer to the Christie Lens Calculator on this website or the downloadable PDF throw distance chart located in the resource tab of this lens option or the resource tab of Christie projector to be used with this lens.