Sigma DC 8-16mm 4.5-5.6 HSM Ultra-Wide Angle Zoom Lens For Pentax K Mount

Sigma DC 8-16mm 4.5-5.6 HSM Ultra-Wide Angle Zoom Lens For Pentax K Mount. Good Pre-owned Condition. Serial number 10931972.  The Sigma 8-16mm f/4.5-5.6 DC HSM lens is an ultra-wide-angle zoom lens explicitly engineered for DSLR cameras utilizing APS-C size image sensors.   Key Technical Overview: - Focal Range: 8–16mm, which yields a highly expansive field of view equivalent to roughly 12–24mm on a full-frame camera. - Maximum Aperture: Variable f/4.5 to f/5.6 depending on how far you zoom. - Focusing Motor: Built-in Hyper-Sonic Motor (HSM) designed for fast and silent autofocus operation.  Build Characteristics:  It features a prominently bulbous, convex front glass element and a permanent, integrated petal-type lens hood to block stray light. Because of the protruding front element, standard screw-on filters cannot be attached directly to the lens thread.   photography, wide angle