"The HD PENTAX-D FA 24-70mm F2.8ED SDM WR lens has a 17-element, 12-group optical construction featuring three ED (Extra-low Dispersion) glass elements, one anomalous-dispersion glass element, and three aspherical elements. It delivers high-contrast, high-resolution images with extra-fine details across the image field from the center to the edges while effectively compensating for a variety of aberrations. When mounted on a PENTAX 35mm full-frame digital SLR camera body, this lens can be used as a standard zoom lens, with a zoom ratio of approximately 2.9-times, covering focal-length ranges from ultra-wide angle to standard. It captures unique, eye-catching images with an exaggerated perspective and a wide depth of field, making it ideal not only for sweeping landscapes, but also for confined indoor scenes with limited depth. Its weather-resistant structure prevents the intrusion of water into the interior. When coupled with a weather-resistant PENTAX 35mm full-frame digital SLR camera body, it creates a dependable, durable imaging system that performs superbly even in the rain or mist, or at locations prone to splashing water.|Versatile zoom lens: covers wide-angle to medium-telephoto ranges. It provides a maximum aperture of F2.8 over the entire zoom range to deliver brilliant images.|Constructed to reduce various aberrations: including colour aberrations while providing high contrast and high resolution throughout the entire image filed atmaximum aperture|SDM (Supersonic Direct-drive Motor): Shoot discreetly with in-lens, Auto Focus motor operation for quick, smooth & 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 5 special seals to prevent intrusion ofwater.|Rounded Diaphragm: Rounded diaphragm adopted. With the rounded diaphragm the border of subject becomes smoother which gives you smooth and beautiful bokeh expression|Quick-Shift Focus System: Originally, when you are using AF shooting and would like to change to MF, you needed to change the camera setting. But with lenses with Quick-Shift Focusing System, you can instantly change to MF by twisting the focus ring.|Zoom Lock Lever: With a heavy lens, it sometimes zoom out owing to its own weight unintentionally. With this, you might accidentally hit the lens and damage it. To avoid the lens barrel from free-falling from its own weight, zoom lock lever is adopte"