Sigma 28-45mm f/1.8 DG DN Art vs Sony FE 20-70mm f/4 G
The bottom line
Similar coverage, different speed: the Sigma 28-45mm f/1.8 DG DN Art opens to f/1.8 versus the Sony FE 20-70mm f/4 G's f/4 — more light and shallower background blur. The Sony FE 20-70mm f/4 G gives that up to stay lighter (488g (1.08 lb)). It comes down to how much you value that extra brightness.
Choose the Sigma 28-45mm f/1.8 DG DN Art if…
- ✓You want more light and background blur — f/1.8 is faster than f/4, better for low light and subject separation.
Choose the Sony FE 20-70mm f/4 G if…
- ✓You need more reach — it goes to 70mm vs 45mm for distant subjects, wildlife and sport.
- ✓You value portability — at 488g (1.08 lb) it's lighter than the 1020g (2.25 lb) alternative for travel and all-day carry.
- ✓You like close-focus work — 0.39x magnification vs 0.26x.
Where they differ
- ›Aperture: the Sigma 28-45mm f/1.8 DG DN Art opens to f/1.8 vs the Sony FE 20-70mm f/4 G's f/4 — more light and shallower depth-of-field.
- ›Focal range: Sigma 28-45mm f/1.8 DG DN Art is 28-45mm, Sony FE 20-70mm f/4 G is 20-70mm — different framing and reach.
- ›Weight: the Sony FE 20-70mm f/4 G is 488g (1.08 lb) vs 1020g (2.25 lb) — you'll feel the difference handheld.
Frequently asked
Is the Sigma 28-45mm f/1.8 DG DN Art or the Sony FE 20-70mm f/4 G better?
Similar coverage, different speed: the Sigma 28-45mm f/1.8 DG DN Art opens to f/1.8 versus the Sony FE 20-70mm f/4 G's f/4 — more light and shallower background blur. The Sony FE 20-70mm f/4 G gives that up to stay lighter (488g (1.08 lb)). It comes down to how much you value that extra brightness.
Who should choose the Sigma 28-45mm f/1.8 DG DN Art?
Choose the Sigma 28-45mm f/1.8 DG DN Art if you want more light and background blur — f/1.8 is faster than f/4, better for low light and subject separation.
Who should choose the Sony FE 20-70mm f/4 G?
Choose the Sony FE 20-70mm f/4 G if you need more reach — it goes to 70mm vs 45mm for distant subjects, wildlife and sport. Choose it if you value portability — at 488g (1.08 lb) it's lighter than the 1020g (2.25 lb) alternative for travel and all-day carry. Choose it if you like close-focus work — 0.39x magnification vs 0.26x.
What is the main difference between the Sigma 28-45mm f/1.8 DG DN Art and the Sony FE 20-70mm f/4 G?
Aperture: the Sigma 28-45mm f/1.8 DG DN Art opens to f/1.8 vs the Sony FE 20-70mm f/4 G's f/4 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 28-45mm | 20-70mm |
| Lens Type | Zoom | Zoom |
| Optical Elements | 18 | 16 |
| Optical Groups | 15 | 13 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.8 | f/4 |
| Minimum Aperture | f/16 | 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° – 51° | 94° – 34° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | XD Linear |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 20 cm | 25 cm |
| Max Magnification | 0.26x | 0.39x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | Yes |
| Declickable Aperture | Yes | Yes |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $1,099 | $1,099 |
| Filter Size | 82mm | 72mm |
| Diameter | 92mm | 78.7mm |
| Length | 149.2mm | 99mm |
| Weight | 1020g (2.25 lb) | 488g (1.08 lb) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
