Panasonic Lumix S 18mm F1.8 vs Sigma 20mm F2 DG DN | Contemporary
Every published spec side by side, with today's lowest prices for the market you've chosen.
Key differences
- Maximum aperture: f/1.8 on the Lumix S 18mm F1.8, against f/2 on the 20mm F2 DG DN | Contemporary.
- Closest focus: 0.18 m on the Lumix S 18mm F1.8, against 0.22 m on the 20mm F2 DG DN | Contemporary.
- Max magnification: 0.20× on the Lumix S 18mm F1.8, against 0.15× on the 20mm F2 DG DN | Contemporary.
- Aperture ring: Yes on the 20mm F2 DG DN | Contemporary, against No on the Lumix S 18mm F1.8.
- Weight: 340 g on the Lumix S 18mm F1.8, against 370 g on the 20mm F2 DG DN | Contemporary.
Lumix S 18mm F1.8 or 20mm F2 DG DN | Contemporary: which should you buy?
Choose the Lumix S 18mm F1.8 for its maximum aperture, closest focus, max magnification and weight.
Choose the 20mm F2 DG DN | Contemporary for its aperture ring.
On paper the Lumix S 18mm F1.8 wins more rows (4 to 1); if the 20mm F2 DG DN | Contemporary'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 | $1,049.99 new | $689.95 new $450 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/1.8 (best) | f/2 |
| Minimum aperture | f/16 | f/22 |
| Made for | Full frame | Full frame |
| Elements / groups | 13 / 12 | 13 / 11 |
| Aperture blades | 9 | 9 |
| Closest focus | 0.18 m (best) | 0.22 m |
| Max magnification | 0.20× (best) | 0.15× |
| Focus & handling | ||
| Autofocus | Yes (Linear motor) | Yes (Stepping motor) |
| Optical stabilisation | No | No |
| Weather sealed | Yes | — |
| Internal zoom | — | — |
| Aperture ring | No | Yes (best) |
| Teleconverter compatible | No | No |
| Size & weight | ||
| Weight | 340 g (best) | 370 g |
| Diameter × length | 73.6 × 82 mm | 70 × 72.4 mm |
| Filter thread | 67 mm | 62 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.