Searching for " Sigma 17-50 mm f 2,8 OS " ?

When searching for " Sigma 17-50 mm f 2,8 OS " we believe you were looking for this lens:
Sigma EX 17-50mm f/2,8 DC OS HSM
Popular searches is normally:
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The lens we think you were searching for is a zoom lens manufactured by Sigma and the model was launched 2010.
Worth knowing is that the lens is also considered to be a normal zoom lenses, a normal lens where you have the possibility to zoom in and out.