Sigma 70-300mm F/4-5.6 DG OS SLD Super Multi-Layer Coated Telephoto Lens for Pentax AF Mount Digital SLR Cameras

Lens Construction 16 Elements 11 Groups Angle of View 34.3 - 8.2 degrees Number of Diaphragm Blades
Product Description High ratio zoom lens housed in a compact construction and incorporating Sigma's original OS (Optical Stabilizer) function. This telephoto zoom lens incorporates Sigma's original OS (Optical Stabilizer) function and is housed in a compact construction. TheOS function offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible. The SLD

Source: Digital Camera and Video Store...