Pentax HD Pentax-DA 55-300mm f/4-5.8 ED WR Lens New HD (High-Definition) Coating optimizes light transmission and minimizes reflection. Weather resistant to handle damp, inclement conditions. Extreme telephoto range zoom lens. PENTAX SP coating protects the exposed lens elements ED elements compensate for chromatic aberration Focal length equivalent to 82.5mm to 450mm in the 35mm format