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I want to buy a Sigma 180mm F/2.8 EX DG Macro OS HSM Sigma.

What does EX mean?

What does DG mean?

What does OS mean?

What does HSM mean?

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    \$\begingroup\$ EX = high-end series, DG = full frame compatible, OS = optical stabilisation, HSM = hyper-sonic motor \$\endgroup\$
    – Guffa
    Jun 16, 2014 at 21:04

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OS is Optical Stabilization, Sigma's term for a system which moves lens elements to compensate for small camera movements.

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