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Optical design
| Format: 35mm SLR
Type: Zoom lens
Focusing: Auto Focus (AF)
Lens mounts: Canon EF, EF-S, Sony A / Minolta A, Nikon F (FX, DX), Sigma SA
First year of production: 2011
Optical design: 17 elements in 13 groups (1SLD+4FLD+3ASmold+1ASHibrid)
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Average price: $900 |
Specifications:
| Focal length | Max. aperture | Min. aperture | Blades | Min. Focus (m.) | Filter Ø (mm.) | Weight (gr/oz) | Length (mm/in) |
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| 12mm - 24mm | f/4.5 - f/5.6 | f/22 | 6 | 0.28 | 82 | 670/23,6 | 120/4,7 |
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Additional information:
The Sigma 12-24 mm f/ 4.5-5.6 DG HSM II
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17 elements in 13 groups
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Angle of view 122°- 84.1°
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6-blade aperture
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Minimum aperture F22
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Minimum focusing distance 280 mm
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Max. magnification 1:6.4
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Diameter 87 mm
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Length 120 mm
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Super Multi-Layer coating
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FLD glass elements
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3 aspherical elements
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HSM+FTM
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Dust and moisture protection
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RRP $ 1,400 (Feb, 2011)
Pros:
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compact and well assembled lens body,
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excellent image quality at the center of the frame,
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reasonably low level of distortion,
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well corrected coma,
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moderate astigmatism,
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quiet, fast and effective autofocus.
Cons:
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low image quality on the edges of a full frame,
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high vignetting (visible even on the DX sensor),
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many problems in bright back light,
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visible chromatic aberration at closer focal lengths,
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no filter capability.
Links to online resources:
Posted by: dv Date of publication: 08.02.2011
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