Pentax DA 55-300mm f/4-5.8 ED Lens for Pentax and Samsung Digital SLR Cameras Extreme Telephoto Range Zoom Lens Focal Length Equivalent To 82.5mm - 450mm In The 35mm Format Pentax(r) Sp Coating Protects Exposed Lens Elements Ed Elements Compensate For Chromatic Aberration Developed Specifically For Pentax(r) Digital SLR Cameras