Sigma 18-50mm F2.8 DC DN ContemporaryvsTamron 17-70mm F/2.8 Di III-A VC RXD
18-50mm F2.8 DC DN Contemporary
18-50mm / F2.8
27-75mm equiv.
—
17-70mm F/2.8 Di III-A VC RXD
17-70mm / F2.8
26-105mm equiv.
—
Which to choose
When the 18-50mm F2.8 DC DN Contemporary suits you better
- Weight245g lighter, so easier to carry
- Close focusFocuses as close as 12cm
When the 17-70mm F/2.8 Di III-A VC RXD suits you better
- Zoom rangeCovers 17-70mm in a single lens
- StabilizationHas stabilization
These points are derived mechanically from the numbers. How a lens actually renders does not show up in specifications, so look at samples before deciding.
Size compared
- 18-50mm F2.8 DC DN Contemporary74.5mm long × 61.6mm diameter
- 17-70mm F/2.8 Di III-A VC RXD119.6mm long × 74.6mm diameter
Specifications compared
| Specification | Sigma 18-50mm F2.8 DC DN Contemporary | Tamron 17-70mm F/2.8 Di III-A VC RXD | Difference |
|---|---|---|---|
| Focal length (wide) | 18mm | 17mm | +1mm |
| Focal length (tele) | 50mm | 70mm | −20mm |
| Max aperture (wide) | F2.8 | F2.8 | — |
| Max aperture (tele) | F2.8 | F2.8 | — |
| Min aperture | F22 | — | No data |
| Min focus distance | 12cm | 19cm | −0.07m |
| Max magnification | 0.35× | — | No data |
| Aperture blades | 7blades | — | No data |
| Weight | 285g | 530g | −245g |
| Length | 74.5mm | 119.6mm | −45.1mm |
| Diameter | 61.6mm | 74.6mm | −13mm |
| Filter size | 55mm | 67mm | −12mm |
| Released | 2021 | 2022 | −1year |
| Stabilization | No | Yes | No |
| Weather sealing | Yes | Yes | — |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as 18-50mm F2.8 DC DN Contemporary relative to 17-70mm F/2.8 Di III-A VC RXD.The highlighted cell is the better side for that specification.
Check prices
18-50mm F2.8 DC DN Contemporary
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17-70mm F/2.8 Di III-A VC RXD
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18-50mm F2.8 DC DN Contemporary in detail17-70mm F/2.8 Di III-A VC RXD in detailAll X Mount lenses