Canon RF24-240mm F4-6.3 IS USMvsSigma 17-40mm F1.8 DC
RF24-240mm F4-6.3 IS USM
24-240mm / F4-6.3
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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 RF24-240mm F4-6.3 IS USM suits you better
- Zoom rangeCovers 24-240mm 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
- Weight190g lighter, so easier to carry
- Weather sealingHas weather sealing
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
- RF24-240mm F4-6.3 IS USM122.5mm long × 80.4mm diameter
- 17-40mm F1.8 DC115.9mm long × 72.9mm diameter
Specifications compared
| Specification | Canon RF24-240mm F4-6.3 IS USM | Sigma 17-40mm F1.8 DC | Difference |
|---|---|---|---|
| Focal length (wide) | 24mm | 17mm | +7mm |
| Focal length (tele) | 240mm | 40mm | +200mm |
| Max aperture (wide) | F4 | F1.8 | 2.3 stops darker |
| Max aperture (tele) | F6.3 | F1.8 | 3.6 stops darker |
| Min aperture | F22 | — | No data |
| Min focus distance | 50cm | — | No data |
| Max magnification | 0.26× | — | No data |
| Aperture blades | 7blades | — | No data |
| Weight | 750g | 560g | +190g |
| Length | 122.5mm | 115.9mm | +6.6mm |
| Diameter | 80.4mm | 72.9mm | +7.5mm |
| Filter size | 72mm | 67mm | +5mm |
| Released | 2019 | 2025 | −6year |
| Stabilization | Yes | No | Yes |
| Weather sealing | No | Yes | No |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as RF24-240mm F4-6.3 IS USM relative to 17-40mm F1.8 DC.The highlighted cell is the better side for that specification.
Check prices
RF24-240mm F4-6.3 IS USM
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17-40mm F1.8 DC
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RF24-240mm F4-6.3 IS USM in detail17-40mm F1.8 DC in detailAll RF mount lenses