Adds flexibility for presentations given in large venues, that require the projector to be positioned farther than the screen size and relative distance allow with standard lens. Focal Length: 70mm-114mm; Zoom ratio: 1:1.6; f Number: 1.7 - 2.0; Screen Size: 40" - 300"; Projection Distance: 6.46' - 87.19'; Throw to Screen Width Ratio: 2.45:1 (wide) to 4.16:1 (tele)