EF-S Mount Lens 16-28.8mm (35mm Equivalent) Aperture Range: f/4.5-5.6 to f/22-29 One UD Element & One Aspherical Element Enhanced Lens Coatings Optical Image Stabilizer STM Stepping Motor for Quiet AF Four-Group Optical Zoom System Full-Time Manual Focus Override Seven-Blade Circular Aperture Type: DSLR lens