Sigma 45mm F2.8 DGvsTamron 17-70mm F/2.8 Di III-A VC RXD
45mm F2.8 DG
45mm / F2.8
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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 45mm F2.8 DG suits you better
- Weight290g 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
- 45mm F2.8 DG48.2mm long × 64mm diameter
- 17-70mm F/2.8 Di III-A VC RXD119.3mm long × 74.6mm diameter
Specifications compared
| Specification | Sigma 45mm F2.8 DG | Tamron 17-70mm F/2.8 Di III-A VC RXD | Difference |
|---|---|---|---|
| Focal length (wide) | 45mm | 17mm | +28mm |
| Focal length (tele) | 45mm | 70mm | −25mm |
| Max aperture (wide) | F2.8 | F2.8 | — |
| Max aperture (tele) | F2.8 | F2.8 | — |
| Min aperture | — | F22 | No data |
| Min focus distance | — | 19cm | No data |
| Max magnification | — | 0.21× | No data |
| Aperture blades | — | 9blades | No data |
| Weight | 235g | 525g | −290g |
| Length | 48.2mm | 119.3mm | −71.1mm |
| Diameter | 64mm | 74.6mm | −10.6mm |
| Filter size | 55mm | 67mm | −12mm |
| Released | 2025 | 2021 | +4year |
| Stabilization | No | Yes | No |
| Weather sealing | Yes | Yes | — |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as 45mm F2.8 DG relative to 17-70mm F/2.8 Di III-A VC RXD.The highlighted cell is the better side for that specification.
Check prices
45mm F2.8 DG
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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.
45mm F2.8 DG in detail17-70mm F/2.8 Di III-A VC RXD in detailAll E-mount lenses