Pentax D FA* 70-200mm F2.8ED DC AW

Manufacturer description: The HD PENTAX-D FA* 70-200mm F2.8ED DC AW has a brand new optical design in the PENTAX Star series, which boasts the highest image quality of all PENTAX interchangeable lenses. In addition to the HD coating, this lens features Aero Bright Coating II, assuring exceptionally low reflectance. Thanks to its large- constant aperture design, the lens provides an accelerated maximum aperture of F2.8 at all focal lengths from 70mm to 200mm. In addition to four super-low dispersion glass elements and two ED (Extra-low Dispersion) glass elements, its optics includes a pair of new Super ED glass elements to effectively compensate chromatic aberration over the entire zoom range and deliver crisp, high-resolution images with edge-to-edge sharpness. Its dustproof, weather-resistant body also makes it extremely dependable and durable in demanding outdoor conditions. This new lens boasts fast yet quiet internal focusing, zoom versatility, and an AF limiter switch which improves autofocus response time.