The BenQ LS3ST2 zoom lens is designed for projectors, offering a motorized focus adjustment for user-friendly operation. With its optical zoom capability of 1.3, this lens provides versatility for various projection setups. The throw ratio of 0.7-0.9:1 allows for a wide range of projection distances, making it suitable for different screen sizes and room configurations. For a 100-inch screen, the ideal projection distance ranges between 1.55 to 1.99 meters, ensuring that installation is practical and efficient.