Lens comparison
Canon RF50mm F1.8 STM vs Sigma 56mm F1.4 DC DN
Side by side on the Canon EOS R50: the view each gives, the weight with the camera and their sizes to one scale. No winner: the numbers that differ are the choice.
Side views to one scale from the makers' published sizes, mount on the left.
| Lens | Canon RF50mm F1.8 STM | Sigma 56mm F1.4 DC DN Contemporary |
|---|---|---|
| Focal length | 50 mm | 56 mm |
| View on the EOS R50 | 80 mm equiv. | 90 mm equiv. |
| Maximum aperture | f/1.8 | f/1.4 |
| StabilisedSame | No | No |
| Made for | Full frame | APS-C |
| Weight | 160 g | 290 g |
| With the EOS R50 | 535 g | 665 g |
| Length × diameter | 40.5 × 69.2 mm | 57.5 × 69 mm |
| Filter | 43 mm | 55 mm |
| Closest focus | 30 cm | 50 cm |
| Magnification | 0.25x | 0.14x |
| Weather sealing | No | Yes |
| FitSame | Fits and works | Fits and works |
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Questions
Which is lighter on the EOS R50?
Canon RF50mm F1.8 STM: Canon RF50mm F1.8 STM 535 g against Sigma 56mm F1.4 DC DN 665 g with the camera, battery and card.
Which one is sharper?
We do not test lenses, so we cannot say; read reviews from people who have used both. The table compares what the makers publish.
Facts checked 9 Oct 2026 against the makers' specification pages. How we check