Canon RF24-50mm F4.5-6.3 IS STMvsSigma 17-40mm F1.8 DC
RF24-50mm F4.5-6.3 IS STM
24-50mm / F4.5-6.3
—
17-40mm F1.8 DC
17-40mm / F1.8
26-60mm equiv.
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Which to choose
When the RF24-50mm F4.5-6.3 IS STM suits you better
- Weight350g lighter, so easier to carry
- StabilizationHas stabilization
When the 17-40mm F1.8 DC suits you better
- Brightness2.6 stops brighter — better in low light and blurs the background more
- Zoom rangeCovers 17-40mm in a single lens
- 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
- RF24-50mm F4.5-6.3 IS STM58mm long × 69.6mm diameter
- 17-40mm F1.8 DC115.9mm long × 72.9mm diameter
Specifications compared
| Specification | Canon RF24-50mm F4.5-6.3 IS STM | Sigma 17-40mm F1.8 DC | Difference |
|---|---|---|---|
| Focal length (wide) | 24mm | 17mm | +7mm |
| Focal length (tele) | 50mm | 40mm | +10mm |
| Max aperture (wide) | F4.5 | F1.8 | 2.6 stops darker |
| Max aperture (tele) | F6.3 | F1.8 | 3.6 stops darker |
| Min aperture | F22 | — | No data |
| Min focus distance | 30cm | — | No data |
| Max magnification | 0.19× | — | No data |
| Aperture blades | 7blades | — | No data |
| Weight | 210g | 560g | −350g |
| Length | 58mm | 115.9mm | −57.9mm |
| Diameter | 69.6mm | 72.9mm | −3.3mm |
| Filter size | 58mm | 67mm | −9mm |
| Released | 2023 | 2025 | −2year |
| Stabilization | Yes | No | Yes |
| Weather sealing | No | Yes | No |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as RF24-50mm F4.5-6.3 IS STM relative to 17-40mm F1.8 DC.The highlighted cell is the better side for that specification.
Check prices
RF24-50mm F4.5-6.3 IS STM
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17-40mm F1.8 DC
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RF24-50mm F4.5-6.3 IS STM in detail17-40mm F1.8 DC in detailAll RF mount lenses