Sigma 120-400mm f/4.5-5.6 AF APO DG HSM Telephoto Zoom Lens for Pentax Digital SLR Cameras

The Sigma 120-400mm F4.5-5.6 DG APO OS HSM is a telephoto zoom lens designed for Full Frame sensors, but may also be used with smaller APS-C size sensors with a corresponding effective increase in focal length to about 180 to 600mm with most cameras. It’s large telephoto zoom range plus its compact size of a mere 8 inches and weight of only 3.6 pounds, make it a great all purpose travel lens. A Hyper Sonic Motor (HSM) ensure quiet, high speed, and accurate autofocusing working with an Optical St
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Sigma Telephoto Lens

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