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Manufacturer description: The Sigma 17-50mm F2.8 EX DC OS HSM is a useful large-aperture standard zoom lens designed exclusively for APS-C format digital SLRs. Covering a focal range of approximately 25-75mm, the 17-50mm features OS optical stabilization, and a HSM ultrasonic-type focus motor. With a minimum focusing distance of 11 inches throughout the entire zoom range this lens offers a useful semi-macro close up capability, for a maximum reproduction ratio of 1:5.
| Lens type | Zoom lens |
| Focal length | 17–50 mm |
| Image stab. | Yes (4 stops claimed) |
| Lens mount | Canon EF, Pentax KAF3, Sony Alpha, Sigma SA, Nikon F (DX) |
| Max aperture | F2.8 |
| Min aperture | F22.0 |
| Min focus | 0.28 m (11.02″) |
| Max magnification | 0.2 x |
| Weight | 565 g (1.25 lb) |
| Length | 92 mm (3.62″) |
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 | 24.1 megapixels 3″ screen APS-C sensor |
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