The HD PENTAX-D FA 150-450mm F4.5-5.6ED DC AW covers focal lengths from 150mm to 450mm - a focal-length range demanded by higher end PENTAX-camera users. Also incorporated are three ED (Extra-low Dispersion) glass elements and a super-low dispersion glass element to effectively compensate chromatic aberration. The highly desirable weather-resistance body protects the inside of the body from both dust and moisture, making it an extremely dependable and durable DSLR accessory in demanding outdoor conditions. Designed for use with current PENTAX K-mount DSLR cameras and future PENTAX sensor technology.