(From Sigma lens literature) The Sigma APO MACRO 150mm F2.8 EX DG OS HSM is a large aperture medium telephoto macro lens which incorporates Sigma's original Optical Stabilizer function. The ...
"Successor to the APO Macro 150mm f/2.8 EX DG HSM ... A floating focusing system moves two different lens groups in the optical path to different positions. This system compensates for astigmatic ...
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