Comparison of Sigma 18-50mm f/3.5-5.6 DC and Sony 28-70mm f/3.5-5.6 OSS SEL2870 [S]ave
| Attribute |  Sony 28-70mm f/3.5-5.6 OSS SEL2870 × |  Sigma 18-50mm f/3.5-5.6 DC × |
|---|---|---|
| Magnification Ratio (x) | 0.19 | 0.29 |
| Filter Size (mm) | 55 | 58 |
| Front Element Rotation | - | - |
| Closest Focus (m) | 0.3 | 0.25 |
| Diameter (mm) | 72.5 | 62 |
| Type | Standard Zoom | Standard Zoom |
| APS Equivalent | 42 - 105mm | 1.5x: 27 - 75mm; 1.6x: 28.8 - 80mm |
| Diagonal Angle of View (degree) | 34.00 - 75.00 | 27.90 - 69.30 |
| Image Circle | 35mm (Full-frame E-Mount) | Image Circle |
| Focal Length (mm) | 28.00 - 70.00 | 18.00 - 50.00 |
| Brand | Sony | Sigma |
| Name | Sony 28-70mm f/3.5-5.6 OSS SEL2870 | Sigma 18-50mm f/3.5-5.6 DC |
| Weight (g) | 295 | 250 |
| Notes | Optical SteadyShot; Included Accessories: ALC-SH130 Petal Lens Hood | Available AF Mounts: Canon, Nikon, Minolta/Sony, Pentax, Four-Thirds, Sigma; HSM version available for Nikon mount |
| Diaphragm Blades | 7 | 7 |
| Aperture (f) | 3.50 - 36.00 | 3.50 - 22.00 |
| Lens Construction | 9 elements in 8 groups, including 3 aspheric and 1 extra-low dispersion element | 8 elements in 8 groups |
| Zoom System | Rotary | Rotary |
| Length (mm) | 83 | 67.5 |
| Diaphragm Blades Type | rounded | - |
| Focus Details | Linear motor | Internal; HSM version available for Nikon mount |
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