IN CAMERA SHAKE REDUCTION (SR): The PENTAX digital SLR K series cameras are equipped with the SR mechanism built into the camera body. Because shake reduction is applied in the camera body, this means that any lens compatible with the K Series cameras will benefit from image stabilization SUPER TELEPHOTO ZOOM: This zoom lens covers a super telephoto range from 150mm to 450mm. It is designed to be compact and light enough to hold during long range shooting of such subjects as wildlife, aircraft and sports OUTSTANDING IMAGE DESCRIPTION: Thanks to its state of the art optics featuring three ED (Extra low Dispersion) glass elements and one superlow dispersion glass element, this zoom lens effectively minimizes spherical and chromatic aberrations, while producing crisp, high quality images free of colour bleeding ALL WEATHER (AW): This lens features a dependable dustproof, weather resistant structure with eight special seals to prevent the intrusion of water and dust into the lens interior HD COATING TO ENHANCE IMAGING POWER: Produce high contrast images with edge to edge sharpness and free of flare and ghost images DC MOTOR: Smooth, quiet AF operation using a built in AF driving motor QUICK SHIFT FOCUS SYSTEM: Possible to instantly switch from autofocus to manual focus operation, by holding the shutter release button halfway down and turning the focus ring after the subject is captured in focus by the camera’s AF system FOUR AF BUTTONS INSTALLED: In order to provide more stable AF operation regardless of the camera’s orientation, this lens provides four AF buttons on its barrel one at every 90 degrees so can be used effectivelly when shotting horizontally or vertically TRIPOD MOUNT BRACKET: Detachable tripod mount with a newly designed with an integrated lock mechanism to secure the lens from falling WHAT'S IN THE BOX: Includes Front lens cap, lens mount cap, Lens Hood and Lens case