Pentax D FA F2.8ED SDM WR 15-30mm f/2.8 Ultra-Wide Angle Zoom Lens for Pentax K SDM (Supersonic Direct-Drive Motor) - Shoot discreetly with in-lens, auto focus motor operation for quick, smooth and quiet performance. HD (High Definition) - Treated with state-of-the-art HD technology; a high grade, multi-layer coating, allowing the user to capture crisp, high-contrast images free of flare and ghosting, even under demanding lighting conditions. ED (Extra Low Dispersion) glass lens elements deliver clear, high resolution imagery with outstanding edge-to-edge sharpness throughout the entire zoom range. WR (Weather Resistant) - Designed with eight specially designed seals to prevent intrusion of water. The lens also features Quick Shift With a minimum focusing distance of just 28cm, this lens can capture subjects with a well-defined sense of depth.