BenQ - 52.80 mm to 79.10 mmf/2.41 - Telephoto Zoom LensThe BenQ 52. 80 mm to 79. 10 mm f 2. 41 Telephoto Zoom Lens is a precision designed projection accessory that expands creative possibilities with a versatile zoom range, a bright maximum aperture, and fast focusing. Specifically engineered for projectors, this lens lets you adjust throw distance with ease, scale images without moving the projector, and achieve crisp, cinema quality results in classrooms, meeting spaces, and home theaters. The 52. 879.