Sigma 28-70mm f/2.8 DG DN Contemporary vs Sony FE 20mm f/1.8 G
The bottom line
These cover different focal lengths — the Sigma 28-70mm f/2.8 DG DN Contemporary is 28-70mm, the Sony FE 20mm f/1.8 G is 20mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 28-70mm f/2.8 DG DN Contemporary for standard zoom, the Sony FE 20mm f/1.8 G for wide-angle.
Choose the Sigma 28-70mm f/2.8 DG DN Contemporary if…
- ✓You need more reach — it goes to 70mm vs 20mm for distant subjects, wildlife and sport.
- ✓You want one-lens flexibility — a 28-70mm zoom covers what the fixed 20mm can't reframe.
Choose the Sony FE 20mm f/1.8 G if…
- ✓You want more light and background blur — f/1.8 is faster than f/2.8, better for low light and subject separation.
- ✓You prefer a fast, compact single focal length — a 20mm prime over a zoom.
- ✓You value portability — at 373g (13.2 oz) it's lighter than the 470g (1.04 lb) alternative for travel and all-day carry.
Where they differ
- ›Aperture: the Sony FE 20mm f/1.8 G opens to f/1.8 vs the Sigma 28-70mm f/2.8 DG DN Contemporary's f/2.8 — more light and shallower depth-of-field.
- ›Focal range: Sigma 28-70mm f/2.8 DG DN Contemporary is 28-70mm, Sony FE 20mm f/1.8 G is 20mm — different framing and reach.
- ›Type: the Sigma 28-70mm f/2.8 DG DN Contemporary is a zoom (flexible framing), the Sony FE 20mm f/1.8 G a prime (one focal length, usually brighter and lighter).
- ›Weight: the Sony FE 20mm f/1.8 G is 373g (13.2 oz) vs 470g (1.04 lb) — you'll feel the difference handheld.
Frequently asked
Is the Sigma 28-70mm f/2.8 DG DN Contemporary or the Sony FE 20mm f/1.8 G better?
These cover different focal lengths — the Sigma 28-70mm f/2.8 DG DN Contemporary is 28-70mm, the Sony FE 20mm f/1.8 G is 20mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 28-70mm f/2.8 DG DN Contemporary for standard zoom, the Sony FE 20mm f/1.8 G for wide-angle.
Who should choose the Sigma 28-70mm f/2.8 DG DN Contemporary?
Choose the Sigma 28-70mm f/2.8 DG DN Contemporary if you need more reach — it goes to 70mm vs 20mm for distant subjects, wildlife and sport. Choose it if you want one-lens flexibility — a 28-70mm zoom covers what the fixed 20mm can't reframe.
Who should choose the Sony FE 20mm f/1.8 G?
Choose the Sony FE 20mm f/1.8 G if you want more light and background blur — f/1.8 is faster than f/2.8, better for low light and subject separation. Choose it if you prefer a fast, compact single focal length — a 20mm prime over a zoom. Choose it if you value portability — at 373g (13.2 oz) it's lighter than the 470g (1.04 lb) alternative for travel and all-day carry.
What is the main difference between the Sigma 28-70mm f/2.8 DG DN Contemporary and the Sony FE 20mm f/1.8 G?
Aperture: the Sony FE 20mm f/1.8 G opens to f/1.8 vs the Sigma 28-70mm f/2.8 DG DN Contemporary's f/2.8 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 28-70mm | 20mm |
| Lens Type | Zoom | Prime |
| Optical Elements | 16 | 14 |
| Optical Groups | 12 | 12 |
| Aperture & Iris | ||
| Maximum Aperture | f/2.8 | f/1.8 |
| Minimum Aperture | f/22 | f/22 |
| Aperture Blades | 9 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | Sony E | Sony E |
| Angle of View | 75° – 34° | 94° – 94° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | Stepping | XD Linear |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 19 cm | 18 cm |
| Max Magnification | 0.3x | 0.22x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | No | Yes |
| Declickable Aperture | No | Yes |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $899 | $899 |
| Filter Size | 67mm | 67mm |
| Diameter | 72.2mm | 73.5mm |
| Length | 101.5mm | 84.7mm |
| Weight | 470g (1.04 lb) | 373g (13.2 oz) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
