Sigma 45mm f/2.8 DG DN Contemporary vs Sony E PZ 10-20mm f/4 G
The bottom line
These cover different focal lengths — the Sigma 45mm f/2.8 DG DN Contemporary is 45mm, the Sony E PZ 10-20mm f/4 G is 10-20mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 45mm f/2.8 DG DN Contemporary for short-telephoto / portrait, the Sony E PZ 10-20mm f/4 G for wide-angle.
Choose the Sigma 45mm f/2.8 DG DN Contemporary if…
- ✓You want more light and background blur — f/2.8 is faster than f/4, better for low light and subject separation.
- ✓You need more reach — it goes to 45mm vs 20mm for distant subjects, wildlife and sport.
- ✓You prefer a fast, compact single focal length — a 45mm prime over a zoom.
Choose the Sony E PZ 10-20mm f/4 G if…
- ✓You shoot wide — it starts at 10mm vs 45mm for landscapes, interiors and architecture.
- ✓You want one-lens flexibility — a 10-20mm zoom covers what the fixed 45mm can't reframe.
- ✓You value portability — at 143g (5.0 oz) it's lighter than the 215g (7.6 oz) alternative for travel and all-day carry.
- ✓You work outdoors — it's weather-sealed against dust and moisture; the other isn't.
Where they differ
- ›Aperture: the Sigma 45mm f/2.8 DG DN Contemporary opens to f/2.8 vs the Sony E PZ 10-20mm f/4 G's f/4 — more light and shallower depth-of-field.
- ›Focal range: Sigma 45mm f/2.8 DG DN Contemporary is 45mm, Sony E PZ 10-20mm f/4 G is 10-20mm — different framing and reach.
- ›Type: the Sony E PZ 10-20mm f/4 G is a zoom (flexible framing), the Sigma 45mm f/2.8 DG DN Contemporary a prime (one focal length, usually brighter and lighter).
- ›Durability: the Sony E PZ 10-20mm f/4 G is weather-sealed; the other isn't.
Frequently asked
Is the Sigma 45mm f/2.8 DG DN Contemporary or the Sony E PZ 10-20mm f/4 G better?
These cover different focal lengths — the Sigma 45mm f/2.8 DG DN Contemporary is 45mm, the Sony E PZ 10-20mm f/4 G is 10-20mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 45mm f/2.8 DG DN Contemporary for short-telephoto / portrait, the Sony E PZ 10-20mm f/4 G for wide-angle.
Who should choose the Sigma 45mm f/2.8 DG DN Contemporary?
Choose the Sigma 45mm f/2.8 DG DN Contemporary if you want more light and background blur — f/2.8 is faster than f/4, better for low light and subject separation. Choose it if you need more reach — it goes to 45mm vs 20mm for distant subjects, wildlife and sport. Choose it if you prefer a fast, compact single focal length — a 45mm prime over a zoom.
Who should choose the Sony E PZ 10-20mm f/4 G?
Choose the Sony E PZ 10-20mm f/4 G if you shoot wide — it starts at 10mm vs 45mm for landscapes, interiors and architecture. Choose it if you want one-lens flexibility — a 10-20mm zoom covers what the fixed 45mm can't reframe. Choose it if you value portability — at 143g (5.0 oz) it's lighter than the 215g (7.6 oz) alternative for travel and all-day carry. Choose it if you work outdoors — it's weather-sealed against dust and moisture; the other isn't.
What is the main difference between the Sigma 45mm f/2.8 DG DN Contemporary and the Sony E PZ 10-20mm f/4 G?
Aperture: the Sigma 45mm f/2.8 DG DN Contemporary opens to f/2.8 vs the Sony E PZ 10-20mm f/4 G's f/4 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 45mm | 10-20mm |
| Lens Type | Prime | Zoom |
| Optical Elements | 10 | 9 |
| Optical Groups | 8 | 7 |
| Aperture & Iris | ||
| Maximum Aperture | f/2.8 | f/4 |
| Minimum Aperture | f/22 | f/22 |
| Aperture Blades | 9 | 7 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | APS-C |
| Lens Mount | Sony E | Sony E |
| Angle of View | 51° | 110° – 71° |
| 35mm Equivalent | − | 15-30mm |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | STM | Linear |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | No |
| Min Focus Distance | 24 cm | 15 cm |
| Max Magnification | 0.19x | 0.21x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | No |
| Declickable Aperture | Yes | No |
| Parfocal | No | No |
| Internal Zoom | No | Yes |
| General | ||
| Price (MSRP) | $599 | $649 |
| Filter Size | 55mm | 55mm |
| Diameter | 62.6mm | 63mm |
| Length | 46.2mm | 46.9mm |
| Weight | 215g (7.6 oz) | 143g (5.0 oz) |
| Weather Sealed | No | Yes |
| Tripod Collar | No | No |
