Sigma 30mm F1.4 DC DNvsTamron 17-70mm F/2.8 Di III-A VC RXD
30mm F1.4 DC DN
30mm / F1.4
45mm equiv.
—
17-70mm F/2.8 Di III-A VC RXD
17-70mm / F2.8
26-105mm equiv.
—
Which to choose
When the 30mm F1.4 DC DN suits you better
- Brightness2.0 stops brighter — better in low light and blurs the background more
- Weight245g 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
- 30mm F1.4 DC DN71.3mm long × 69mm diameter
- 17-70mm F/2.8 Di III-A VC RXD117.3mm long × 74.6mm diameter
Specifications compared
| Specification | Sigma 30mm F1.4 DC DN | Tamron 17-70mm F/2.8 Di III-A VC RXD | Difference |
|---|---|---|---|
| Focal length (wide) | 30mm | 17mm | +13mm |
| Focal length (tele) | 30mm | 70mm | −40mm |
| Max aperture (wide) | F1.4 | F2.8 | 2.0 stops brighter |
| Max aperture (tele) | F1.4 | F2.8 | 2.0 stops brighter |
| Min focus distance | — | 19cm | No data |
| Weight | 285g | 530g | −245g |
| Length | 71.3mm | 117.3mm | −46mm |
| Diameter | 69mm | 74.6mm | −5.6mm |
| Filter size | 52mm | 67mm | −15mm |
| Released | 2024 | 2026 | −2year |
| Stabilization | No | Yes | No |
| Weather sealing | Yes | Yes | — |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as 30mm F1.4 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
30mm F1.4 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.
30mm F1.4 DC DN in detail17-70mm F/2.8 Di III-A VC RXD in detailAll RF mount lenses