Comparison of Sigma 28-105mm f/3.8-5.6 UC-III Aspherical IF and Tamron AF 28-80mm f/3.5-5.6 Aspherical [S]ave
| Attribute |  Sigma 28-105mm f/3.8-5.6 UC-III Aspherical IF × |  Tamron AF 28-80mm f/3.5-5.6 Aspherical × |
|---|---|---|
| Magnification Ratio (x) | 0.18 | 0.13 |
| Filter Size (mm) | 62 | 58 |
| Focus Details | Internal | - |
| Closest Focus (m) | 0.5 | 0.7 |
| Lens Construction | 13 elements in 12 groups, including 1 aspherical element | 7 elements in 7 groups |
| Length (mm) | 72.5 | 70.4 |
| Focal Length (mm) | 28.00 - 105.00 | 28.00 - 80.00 |
| Diagonal Angle of View (degree) | 23.30 - 75.40 | 30.00 - 75.00 |
| Brand | Sigma | Tamron |
| Image Circle | 35mm | 35mm |
| Name | Sigma 28-105mm f/3.8-5.6 UC-III Aspherical IF | Tamron AF 28-80mm f/3.5-5.6 Aspherical |
| Weight (g) | 275 | 237 |
| Type | Standard Zoom | Standard Zoom |
| Notes | Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax | Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Lens Hood |
| APS Equivalent | 1.5x: 42 - 157.5mm; 1.6x: 44.8 - 168mm | 1.5x: 42 - 120mm; 1.6x: 44.8 - 128mm |
| Aperture (f) | 3.80 - 22.00 | 3.50 - 22.00 |
| Diaphragm Blades | 7 | 6 |
| Zoom System | Rotary | Rotary |
| Diameter (mm) | 71 | 72 |
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