Sigma 20mm f/2 DG DN Contemporary (L-mount) vs Sigma 24mm f/3.5 DG DN Contemporary (L-mount)
The bottom line
These cover different focal lengths — the Sigma 20mm f/2 DG DN Contemporary (L-mount) is 20mm, the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) is 24mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 20mm f/2 DG DN Contemporary (L-mount) for wide-angle, the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) for standard.
Choose the Sigma 20mm f/2 DG DN Contemporary (L-mount) if…
- ✓You want more light and background blur — f/2 is faster than f/3.5, better for low light and subject separation.
- ✓You work outdoors — it's weather-sealed against dust and moisture; the other isn't.
Choose the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) if…
- ✓You value portability — at 225g (7.9 oz) it's lighter than the 370g (13.1 oz) alternative for travel and all-day carry.
- ✓You like close-focus work — 0.55x magnification vs 0.19x.
Where they differ
- ›Aperture: the Sigma 20mm f/2 DG DN Contemporary (L-mount) opens to f/2 vs the Sigma 24mm f/3.5 DG DN Contemporary (L-mount)'s f/3.5 — more light and shallower depth-of-field.
- ›Focal range: Sigma 20mm f/2 DG DN Contemporary (L-mount) is 20mm, Sigma 24mm f/3.5 DG DN Contemporary (L-mount) is 24mm — different framing and reach.
- ›Close-up: the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) reaches 0.55x magnification vs 0.19x — more for close-up and macro work.
- ›Weight: the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) is 225g (7.9 oz) vs 370g (13.1 oz) — you'll feel the difference handheld.
- ›Durability: the Sigma 20mm f/2 DG DN Contemporary (L-mount) is weather-sealed; the other isn't.
Frequently asked
Is the Sigma 20mm f/2 DG DN Contemporary (L-mount) or the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) better?
These cover different focal lengths — the Sigma 20mm f/2 DG DN Contemporary (L-mount) is 20mm, the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) is 24mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 20mm f/2 DG DN Contemporary (L-mount) for wide-angle, the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) for standard.
Who should choose the Sigma 20mm f/2 DG DN Contemporary (L-mount)?
Choose the Sigma 20mm f/2 DG DN Contemporary (L-mount) if you want more light and background blur — f/2 is faster than f/3.5, better for low light and subject separation. Choose it if you work outdoors — it's weather-sealed against dust and moisture; the other isn't.
Who should choose the Sigma 24mm f/3.5 DG DN Contemporary (L-mount)?
Choose the Sigma 24mm f/3.5 DG DN Contemporary (L-mount) if you value portability — at 225g (7.9 oz) it's lighter than the 370g (13.1 oz) alternative for travel and all-day carry. Choose it if you like close-focus work — 0.55x magnification vs 0.19x.
What is the main difference between the Sigma 20mm f/2 DG DN Contemporary (L-mount) and the Sigma 24mm f/3.5 DG DN Contemporary (L-mount)?
Aperture: the Sigma 20mm f/2 DG DN Contemporary (L-mount) opens to f/2 vs the Sigma 24mm f/3.5 DG DN Contemporary (L-mount)'s f/3.5 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 20mm | 24mm |
| Lens Type | Prime | Prime |
| Optical Elements | 13 | 10 |
| Optical Groups | 11 | 8 |
| Aperture & Iris | ||
| Maximum Aperture | f/2 | f/3.5 |
| Minimum Aperture | f/16 | f/22 |
| Aperture Blades | 9 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | L-Mount | L-Mount |
| Angle of View | 94° | 84° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | HLA |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 22 cm | 23 cm |
| Max Magnification | 0.19x | 0.55x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | Yes |
| Declickable Aperture | Yes | Yes |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $549 | $549 |
| Filter Size | 67mm | 55mm |
| Diameter | 74.8mm | 62mm |
| Length | 90.5mm | 61.4mm |
| Weight | 370g (13.1 oz) | 225g (7.9 oz) |
| Weather Sealed | Yes | No |
| Tripod Collar | No | No |
