Samyang AF 18mm F2.8 FE vs Viltrox AF 20mm F2.8 Air
Every published spec side by side, with today's lowest prices for the market you've chosen.
Key differences
- Closest focus: 0.19 m on the AF 20mm F2.8 Air, against 0.25 m on the AF 18mm F2.8 FE.
- Max magnification: 0.17× on the AF 20mm F2.8 Air, against 0.09× on the AF 18mm F2.8 FE.
- Weight: 145 g on the AF 18mm F2.8 FE, against 157 g on the AF 20mm F2.8 Air.
AF 18mm F2.8 FE or AF 20mm F2.8 Air: which should you buy?
Choose the AF 18mm F2.8 FE for its weight.
Choose the AF 20mm F2.8 Air for its closest focus and max magnification.
On paper the AF 20mm F2.8 Air wins more rows (2 to 1); if the AF 18mm F2.8 FE's strengths are the ones you shoot with, and its price is lower where you buy, it can still be the better buy.
 |  | |
|---|---|---|
| Lowest price today | $155 used | $150 used |
| Optics | ||
| Focal length | 18mm | 20mm |
| 35mm equivalent | 18mm (full frame) | 20mm (full frame) |
| Maximum apertureLower f-number lets in more light. A zoom wins only when it is as bright at both ends. | f/2.8 | f/2.8 |
| Minimum aperture | f/22 | f/16 |
| Made for | Full frame | Full frame |
| Elements / groups | 9 / 8 | 10 / 8 |
| Aperture blades | 7 | 7 |
| Closest focus | 0.25 m | 0.19 m (best) |
| Max magnification | 0.09× | 0.17× (best) |
| Focus & handling | ||
| Autofocus | Yes (Linear STM) | Yes (STM) |
| Optical stabilisation | No | No |
| Weather sealed | No | — |
| Internal zoom | — | — |
| Aperture ring | No | — |
| Teleconverter compatible | No | No |
| Size & weight | ||
| Weight | 145 g (best) | 157 g |
| Diameter × length | 63.5 × 60.5 mm | 65 × 59.5 mm |
| Filter thread | 58 mm | 52 mm |
Green marks the better figure where “better” is unambiguous. A dash means the maker doesn't publish it or we haven't verified it yet.