Sony FE 20mm f/1.8 G vs Viltrox AF 20mm f/2.8
Sony FE 20mm f/1.8 G has more in its favour on paper. The FE 20mm f/1.8 G gathers more light for low light and background blur; the AF 20mm f/2.8 is lighter and cheaper. The Sony lens is the mount maker's own, while the Viltrox is a third-party alternative.
Choose the FE 20mm f/1.8 G for
- a brighter maximum aperture (f/1.8, about 1.3 stops more light)
- weather sealing
Choose the AF 20mm f/2.8 for
- less weight (155g vs 373g)
- a lower price (about £150 vs £510)
| FE 20mm f/1.8 G | AF 20mm f/2.8 | |
|---|---|---|
| Brand | Sony | Viltrox |
| Focal length | 20mm | 20mm |
| Maximum aperture | f/1.8 | f/2.8 |
| Weight | 373 g | 155 g |
| Stabilisation | No | No |
| Weather sealing | Yes | No |
| Filter size | 67mm | 52mm |
| Made for | Full frame | Full frame |
| New price | £849 | £149 |
| Used at MPB (Sony E / FE) | £444–£574 | £140–£154 |
More lens comparisons
See all Sony E / FE cameras and lenses.
Frequently asked questions
Is the Sony FE 20mm f/1.8 G better than the Viltrox AF 20mm f/2.8?
The FE 20mm f/1.8 G offers a brighter maximum aperture (f/1.8, about 1.3 stops more light), weather sealing; the AF 20mm f/2.8 offers less weight (155g vs 373g), a lower price (about £150 vs £510).
Which is better value, the FE 20mm f/1.8 G or the AF 20mm f/2.8?
On Sony E / FE, the Viltrox AF 20mm f/2.8 costs about £150 against about £510 for the Sony FE 20mm f/1.8 G (MPB used where listed, otherwise new; checked 5 November 2026).
Is f/1.8 worth it over f/2.8?
f/1.8 gathers about 1.3 stops more light, which helps indoors, at night and for background blur. If you mostly shoot in good light, the slower lens is usually lighter and cheaper.
Do both lenses fit the same cameras?
Both are available for Sony E / FE (and other mounts: Nikon Z).