Acronyms are:
DC - designed for digital cameras with smaller sensors (APS-C)
EX - superior external build and image quality
OS - Optical Stabiliser
HSM- Hyper-Sonic Motor
LInks to Sigma press release below each image.
50-200mm F4-5.6 DC OS HSM
10-20mm F3.5 EX DC HSM
18-50mm F2.8-4.5 DC OS HSM
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