| Name | Sigma 120-400mm f/4.5-5.6 DG OS HSM APO |
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| Image Circle | 35mm |
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| Type | Telephoto Zoom |
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| Focal Length | 120 - 400mm |
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| Min Aperture | f/22 |
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| Max Aperture | f/4.5 - 5.6 |
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| Diaphragm Blades | 9 |
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| Lens Construction | 21 elements in 15 groups, including 3 SLD elements |
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| Diagonal Angle of View (Based on image circle) | 20.4 - 6.2 degrees |
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| Focus Details | Internal, with HSM |
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| Front Element Rotation | No |
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| Zoom System | Rotary |
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| Closest Focus | 150cm / 59.1 in. |
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| Magnification Ratio | 0.24x / 1:4.2 |
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| Filter Size | 77mm (Rear) |
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| Dimensions (Length x Diameter) | 203.5mm x 92.5mm / 8.0 in. x 3.6 in. |
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| Weight | 1.75kg / 3.9 lb |
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| Notes | Optically Stabilized; Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony |
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| Typical Online Price | US$850 |
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| APS Equivalent | 1.5x: 180 - 600mm; 1.6x: 192 - 640mm |
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