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Optical design
| Format: APS-C (crop)
Type: Zoom lens
Focusing: Auto Focus (AF)
Lens mounts: Canon EF, EF-S, Canon EF, EF-S, Sony A / Minolta A, Sony A / Minolta A, Nikon F (FX, DX), Nikon F (FX, DX), Pentax K, Pentax K, Sigma SA, Sigma SA
First year of production: 2010
Optical design: 17 elements in 13 groups (3 AS, 1 ELD)
Features: Ultra-Sonic Motor, Optical stabilisation | User reviews (0) Photos (8) Tests (0) Owners (7) Views (11880) Average price: $570 |
Specifications:
| Focal length | Max. aperture | Min. aperture | Blades | Min. Focus (m.) | Filter Ø (mm.) | Weight (gr/oz) | Length (mm/in) |
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| 17mm - 70mm | f/2.8 - f/4.0 | f/22 | 7 | 0.22 | 72 | 535/18,9 | 89/3,5 |
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Additional information:
The Sigma 17-70 mm F 2.8-4 DC Macro OS HSM
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Diagonal angle of view 72.4° - 20.2° (1.7х Foveon)
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Equivalent focal length 27-112 mm on APS-C
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Max. magnification 1:2.7
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Minimum working distance 47 mm
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LH780-04 hood is included with the lens.
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Diameter 79 mm
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Price - $ 690 at the American website.
The Sigma 17-70mm F2.8-4 DC Macro OS HSM is a standard fast zoom lens with a large aperture and switchable system of optical image stabilization which is designed for digital SLR cameras with a crop factor not less than1.5. The 4-stop optical stabilizer is compatible with the Sony and Pentax bayonet mounts only on Sigma lenses even if the lens body has an Anti-Shake function . In practice there are no more than 3 f/ stops of optical image stabilization instead of 4 claimed by Sigma .
The optical scheme of the Sigma 17-70 mm F 2.8-4 DC Macro OS HSM includes three aspherical elements (one hybrid and two molded) and one ELD element for correction of all types of aberrations. The super multi-coating of optic elements reduces flare and halation, and increases contrast.
Hyper Sonic Motor provides quiet and high-speed autofocusing. Internal system of focusing eliminates the front lens rotation, which makes it possible to use a petal hood and polarized filters. The size of the lens changes while zooming. The Sigma 17-70 mm F 2.8-4 DC Macro OS HSM is equipped with a zoom lock mechanism for preventing undesired barrel extension. The distance scale is marked on the lens barrel.
In 2012 a new version of the lens with the same name but different optical scheme and exterior was announced.
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Focal length
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17
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24
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28
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35
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43
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50
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60
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70
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f/
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2.8
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3.2
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3.5
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3.5
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3.5
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4.0
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4.0
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4.0
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Links to online resources:
PDF Files:
Posted by: dv Date of publication: 27.10.2010
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