Sigma 45mm f/2.8 DG DN Contemporary vs Leica Summicron-SL 50mm f/2 ASPH
Sigma 45mm f/2.8 DG DN Contemporary has more in its favour on paper. The Summicron-SL 50mm f/2 ASPH gathers more light for low light and background blur; the 45mm f/2.8 DG DN Contemporary is lighter and cheaper.
Choose the 45mm f/2.8 DG DN Contemporary for
- less weight (215g vs 320g)
- a lower price (about £320 vs £1,170)
Choose the Summicron-SL 50mm f/2 ASPH for
- a brighter maximum aperture (f/2, about 1.0 stops more light)
- weather sealing
| 45mm f/2.8 DG DN Contemporary | Summicron-SL 50mm f/2 ASPH | |
|---|---|---|
| Brand | Sigma | Leica |
| Focal length | 45mm | 50mm |
| Maximum aperture | f/2.8 | f/2 |
| Weight | 215 g | 320 g |
| Stabilisation | No | No |
| Weather sealing | No | Yes |
| Filter size | 55mm | 55mm |
| Made for | Full frame | Full frame |
| New price | £499 | £2,400 |
| Used at MPB (L-Mount) | £309–£324 | £1,119–£1,219 |
More lens comparisons
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Frequently asked questions
Is the Sigma 45mm f/2.8 DG DN Contemporary better than the Leica Summicron-SL 50mm f/2 ASPH?
The 45mm f/2.8 DG DN Contemporary offers less weight (215g vs 320g), a lower price (about £320 vs £1,170); the Summicron-SL 50mm f/2 ASPH offers a brighter maximum aperture (f/2, about 1.0 stops more light), weather sealing.
Which is better value, the 45mm f/2.8 DG DN Contemporary or the Summicron-SL 50mm f/2 ASPH?
On L-Mount, the Sigma 45mm f/2.8 DG DN Contemporary costs about £320 against about £1,170 for the Leica Summicron-SL 50mm f/2 ASPH (MPB used where listed, otherwise new; checked 5 November 2026).
Is f/2 worth it over f/2.8?
f/2 gathers about 1.0 stops more light, which helps indoors, at night and for background blur. If you mostly shoot in good light, the slower lens is usually lighter and cheaper.
Do both lenses fit the same cameras?
Both are available for L-Mount (and other mounts: Sony E / FE).