Canon RF50mm F1.8 STMvsSigma 18-50mm F2.8 DC DN
RF50mm F1.8 STM
50mm / F1.8
—
18-50mm F2.8 DC DN
18-50mm / F2.8
27-75mm equiv.
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Which to choose
When the RF50mm F1.8 STM suits you better
- Brightness1.3 stops brighter — better in low light and blurs the background more
- Weight140g lighter, so easier to carry
When the 18-50mm F2.8 DC DN suits you better
- Zoom rangeCovers 18-50mm 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
- RF50mm F1.8 STM40.5mm long × 69.2mm diameter
- 18-50mm F2.8 DC DN74.5mm long × 69.2mm diameter
Specifications compared
| Specification | Canon RF50mm F1.8 STM | Sigma 18-50mm F2.8 DC DN | Difference |
|---|---|---|---|
| Focal length (wide) | 50mm | 18mm | +32mm |
| Focal length (tele) | 50mm | 50mm | — |
| Max aperture (wide) | F1.8 | F2.8 | 1.3 stops brighter |
| Max aperture (tele) | F1.8 | F2.8 | 1.3 stops brighter |
| Min aperture | F22 | — | No data |
| Min focus distance | 30cm | — | No data |
| Max magnification | 0.25× | — | No data |
| Aperture blades | 7blades | — | No data |
| Weight | 160g | 300g | −140g |
| Length | 40.5mm | 74.5mm | −34mm |
| Diameter | 69.2mm | 69.2mm | — |
| Filter size | 43mm | 55mm | −12mm |
| Released | 2020 | 2024 | −4year |
| Stabilization | No | No | — |
| Weather sealing | No | Yes | No |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as RF50mm F1.8 STM relative to 18-50mm F2.8 DC DN.The highlighted cell is the better side for that specification.
Check prices
RF50mm F1.8 STM
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18-50mm F2.8 DC DN
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RF50mm F1.8 STM in detail18-50mm F2.8 DC DN in detailAll RF mount lenses