Canon RF24-105mm F4 L IS USMvsSigma 17-40mm F1.8 DC
RF24-105mm F4 L IS USM
24-105mm / F4
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17-40mm F1.8 DC
17-40mm / F1.8
26-60mm equiv.
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Which to choose
When the RF24-105mm F4 L IS USM suits you better
- Zoom rangeCovers 24-105mm in a single lens
- StabilizationHas stabilization
When the 17-40mm F1.8 DC suits you better
- Brightness2.3 stops brighter — better in low light and blurs the background more
- Weight140g 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
- RF24-105mm F4 L IS USM107.3mm long × 83.5mm diameter
- 17-40mm F1.8 DC115.9mm long × 72.9mm diameter
Specifications compared
| Specification | Canon RF24-105mm F4 L IS USM | Sigma 17-40mm F1.8 DC | Difference |
|---|---|---|---|
| Focal length (wide) | 24mm | 17mm | +7mm |
| Focal length (tele) | 105mm | 40mm | +65mm |
| Max aperture (wide) | F4 | F1.8 | 2.3 stops darker |
| Max aperture (tele) | F4 | F1.8 | 2.3 stops darker |
| Min aperture | F22 | — | No data |
| Min focus distance | 45cm | — | No data |
| Max magnification | 0.24× | — | No data |
| Aperture blades | 9blades | — | No data |
| Weight | 700g | 560g | +140g |
| Length | 107.3mm | 115.9mm | −8.6mm |
| Diameter | 83.5mm | 72.9mm | +10.6mm |
| Filter size | 77mm | 67mm | +10mm |
| Released | 2018 | 2025 | −7year |
| Stabilization | Yes | No | Yes |
| Weather sealing | Yes | Yes | — |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as RF24-105mm F4 L IS USM relative to 17-40mm F1.8 DC.The highlighted cell is the better side for that specification.
Check prices
RF24-105mm F4 L IS USM
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17-40mm F1.8 DC
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RF24-105mm F4 L IS USM in detail17-40mm F1.8 DC in detailAll RF mount lenses