The new Sigma 17-70mm F2.8-4 DC MACRO OS HSM lens is the latest version of lens started as 28-105mm F2.8-4. New in this edition is the optical stabilizer. This lens, designed for APS-C size sensors, providing a larger aperture at its wide end (F2.8). It is unique in this standard zoom class, providing F2.8 at affordable price. Other alternatives, for comparison, are fixed F2.8 zoom lenses that considered professional (And have a price tag to match). Here, the larger F2.8 aperture is available only at its wider end, limited its usage (Low light and night shots) to mostly scenic subjects.
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Bottom line, it is a good alternative to the standard zoom kit lenses provided by camera manufactures.
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