Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. § 03 Head to head
Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. vs Sigma C 20 mm f/2 DG DN
Leica 21mm f/2 has a longer reach. Sigma 20mm f/2 has a wider field of view.
The Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. is a 21mm f/2 prime, and the Sigma C 20 mm f/2 DG DN is a 20mm f/2 prime. On paper the Sigma C 20 mm f/2 DG DN comes out ahead, 5 advantages to 2, but which one suits you depends on what you shoot.
Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. 
Sigma C 20 mm f/2 DG DN 01
Key differences
Why is the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. better than the Sigma C 20 mm f/2 DG DN?
- Longer reach (21mm vs 20mm)
- Newer design (2023 vs 2022)
Why is the Sigma C 20 mm f/2 DG DN better than the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH.?
- Wider field of view (20mm vs 21mm)
- 430 g lighter (370 g vs 800 g)
- 32 mm shorter (70 mm vs 102 mm long)
- Focuses 3 cm closer (0.22 m vs 0.25 m)
- Smaller filter thread (62 mm vs 82 mm)
02
Which should you buy?
- landscape For landscape photography, the Sigma C 20 mm f/2 DG DN has the edge: it goes wider, to 20mm against 21mm.
- architecture For architecture, the Sigma C 20 mm f/2 DG DN has the edge: it goes wider, to 20mm against 21mm.
- astrophotography For astrophotography, the Sigma C 20 mm f/2 DG DN has the edge: it goes wider, to 20mm against 21mm.
03
Specification
| Specification | Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. | Sigma C 20 mm f/2 DG DN |
|---|---|---|
| Focal length | 21mm | 20mm |
| Maximum aperture | f/2 | f/2 |
| Minimum aperture | f/22 | f/22 |
| Lens type | Prime lens | Prime lens |
| Format | Full frame | Full frame |
| Weight | 800 g (1.76 lbs) | 370 g ◆ |
| Dimensions | 88 mm (diameter) x 102 mm (length) | 74.4 x 70 mm |
| Minimum focusing distance | 0.25 m (9.8 in) | 0.22 m ◆ |
| Image stabilization | No | No |
| Weather sealing | Yes | — |
| Aperture ring | No | No |
| Aperture blades | Not specified | 9 |
| Optical construction | 14 elements in 11 groups (4 aspherical elements) | 13 elements / 11 groups |
| Filter size | 82 mm | 62 mm ◆ |
| Lens mount | L-Mount | Sony E, L-Mount |
| Released | 2023 | 2022 |
| Price | $5,495 launch price | — |
04
Size
- A · Leica
- B · Sigma
- 102 × 88 mm
- 70 × 74.4 mm
The Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. is 32 mm longer and 430 g heavier than the Sigma C 20 mm f/2 DG DN.
05
Sample frames
Leica Super-APO-Summicron-SL 21 mm f/2 ASPH.
Sigma C 20 mm f/2 DG DN
06
Video reviews
07
Questions
- Which is lighter, the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. or the Sigma C 20 mm f/2 DG DN?
- The Sigma C 20 mm f/2 DG DN weighs 370 g, 430 g less than the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. (800 g).
- Which focuses closer, the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. or the Sigma C 20 mm f/2 DG DN?
- The Sigma C 20 mm f/2 DG DN focuses down to 0.22 m, against 0.25 m for the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH..
- Do the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. and the Sigma C 20 mm f/2 DG DN have image stabilization?
- No, neither lens has optical image stabilization; rely on in-body stabilization if your camera has it.
- Is the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. or the Sigma C 20 mm f/2 DG DN better for landscape photography?
- For landscape photography, the Sigma C 20 mm f/2 DG DN has the edge: it goes wider, to 20mm against 21mm.
- Is the Leica Super-APO-Summicron-SL 21 mm f/2 ASPH. or the Sigma C 20 mm f/2 DG DN better for architecture?
- For architecture, the Sigma C 20 mm f/2 DG DN has the edge: it goes wider, to 20mm against 21mm.
08