Canon RS-SL07RST - 22.67 mm to 39.79 mm - f/2.4 - f/2.1 - Standard Zoom LensThe Canon RS SL07RST is a precision built standard zoom lens designed to unlock the full potential of projector based displays. With a focal length range of 22. 67 mm to 39. 79 mm and a 1. 8x optical zoom, this lens lets you adapt to diverse room sizes, throw distances, and audience sizes without relocating your projector. The bright aperture of f 2. 4 at the wide end and f 2. 1 at the telephoto end delivers vibrant, high contrast images with rich