Sigma 15mm F1.4 DCvsTamron 11-20mm F/2.8 Di III-A RXD
15mm F1.4 DC
15mm / F1.4
23mm equiv.
—
11-20mm F/2.8 Di III-A RXD
11-20mm / F2.8
17-30mm equiv.
—
Which to choose
When the 15mm F1.4 DC suits you better
- Brightness2.0 stops brighter — better in low light and blurs the background more
- Weight100g lighter, so easier to carry
When the 11-20mm F/2.8 Di III-A RXD suits you better
- Zoom rangeCovers 11-20mm in a single lens
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
- 15mm F1.4 DC62.8mm long × 69mm diameter
- 11-20mm F/2.8 Di III-A RXD84.2mm long × 73mm diameter
Specifications compared
| Specification | Sigma 15mm F1.4 DC | Tamron 11-20mm F/2.8 Di III-A RXD | Difference |
|---|---|---|---|
| Focal length (wide) | 15mm | 11mm | +4mm |
| Focal length (tele) | 15mm | 20mm | −5mm |
| 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 | — | 15cm | No data |
| Weight | 240g | 340g | −100g |
| Length | 62.8mm | 84.2mm | −21.4mm |
| Diameter | 69mm | 73mm | −4mm |
| Filter size | 58mm | 67mm | −9mm |
| Released | 2026 | 2024 | +2year |
| Stabilization | No | No | — |
| Weather sealing | Yes | Yes | — |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as 15mm F1.4 DC relative to 11-20mm F/2.8 Di III-A RXD.The highlighted cell is the better side for that specification.
Check prices
15mm F1.4 DC
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11-20mm F/2.8 Di III-A 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.
15mm F1.4 DC in detail11-20mm F/2.8 Di III-A RXD in detailAll RF mount lenses