Sigma 17-40mm F1.8 DCvsSigma 30mm F1.4 DC DN
17-40mm F1.8 DC
17-40mm / F1.8
26-60mm equiv.
—
30mm F1.4 DC DN
30mm / F1.4
45mm equiv.
—
Which to choose
When the 17-40mm F1.8 DC suits you better
- Zoom rangeCovers 17-40mm in a single lens
When the 30mm F1.4 DC DN suits you better
- Brightness0.7 stops brighter — better in low light and blurs the background more
- Weight275g lighter, so easier to carry
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
- 17-40mm F1.8 DC115.9mm long × 72.9mm diameter
- 30mm F1.4 DC DN71.3mm long × 69mm diameter
Specifications compared
| Specification | Sigma 17-40mm F1.8 DC | Sigma 30mm F1.4 DC DN | Difference |
|---|---|---|---|
| Focal length (wide) | 17mm | 30mm | −13mm |
| Focal length (tele) | 40mm | 30mm | +10mm |
| Max aperture (wide) | F1.8 | F1.4 | 0.7 stops darker |
| Max aperture (tele) | F1.8 | F1.4 | 0.7 stops darker |
| Weight | 560g | 285g | +275g |
| Length | 115.9mm | 71.3mm | +44.6mm |
| Diameter | 72.9mm | 69mm | +3.9mm |
| Filter size | 67mm | 52mm | +15mm |
| Released | 2025 | 2024 | +1year |
| Stabilization | No | No | — |
| Weather sealing | Yes | Yes | — |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as 17-40mm F1.8 DC relative to 30mm F1.4 DC DN.The highlighted cell is the better side for that specification.
Check prices
17-40mm F1.8 DC
ADLinks to Amazon, MPB, Wex Photo Video, Park Cameras, eBay are affiliate links. We may earn a commission if you buy through them, at no extra cost to you.Links to London Camera Exchange are not affiliate links.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
ADLinks to Amazon, MPB, Wex Photo Video, Park Cameras, eBay are affiliate links. We may earn a commission if you buy through them, at no extra cost to you.Links to London Camera Exchange are not affiliate links.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.
17-40mm F1.8 DC in detail30mm F1.4 DC DN in detailAll RF mount lenses