The Canon RS-SL06UW Ultra Short Fixed Zoom Lens gives a crisp projection of the images with reduced shadows and glare. Ideal for small conference rooms, this lens provides a throw ratio of 0.54:1. The focal length is fixed at 8.39mm, and F-stop number is at F2.4. With this lens, you can adjust the shift -15 to 75% vertically and ±30% horizontally. The lens is made for a screen size of 40 to 600 inches.