The pentax 150 450mm f45 56 ed dc aw d fa hd is a super telephoto zoom lens with all weather construction designed for shooting a wide range of topics including sport portraiture aviation and wildlife this pentax k mount lens for digital slr cameras is compact and light enough to use freehand without a tripod high grade hd coating three ed extra low dispersion glass elements and a super low dispersion glass element reduces chromatic aberration and ensure sharp high contrast images acr