Sigma 18-50mm F2.8 DC DNvsTamron 17-70mm F/2.8 Di III-A VC RXD
18-50mm F2.8 DC DN
18-50mm / F2.8
27-75mm equiv.
—
17-70mm F/2.8 Di III-A VC RXD
17-70mm / F2.8
26-105mm equiv.
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Which to choose
When the 18-50mm F2.8 DC DN suits you better
- Weight230g lighter, so easier to carry
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 DN74.5mm long × 69.2mm diameter
- 17-70mm F/2.8 Di III-A VC RXD117.3mm long × 74.6mm diameter
Specifications compared
| Specification | Sigma 18-50mm F2.8 DC DN | 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 focus distance | — | 19cm | No data |
| Weight | 300g | 530g | −230g |
| Length | 74.5mm | 117.3mm | −42.8mm |
| Diameter | 69.2mm | 74.6mm | −5.4mm |
| Filter size | 55mm | 67mm | −12mm |
| Released | 2024 | 2026 | −2year |
| 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 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
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17-70mm F/2.8 Di III-A VC RXD
ADLinks to Amazon, B&H Photo, Adorama, KEH Camera, MPB, eBay are affiliate links. We may earn a commission if you buy through them, at no extra cost to you.Links marked “Search results” go to that retailer’s search page for this lens name.Check price and availability on the retailer’s own site.
18-50mm F2.8 DC DN in detail17-70mm F/2.8 Di III-A VC RXD in detailAll RF mount lenses