Sigma 90mm f/2.8 DG Contemporary (Sony E) vs Tamron 20mm f/2.8 Di III OSD (Sony E)
Side-by-side used price and spec comparison. Lowest current prices pulled daily from the major used-gear sites.
Lowest now
$130
MSRP
$639
-80% vs MSRP
Lowest since we started watching
The lowest we've seen, though we've only been tracking this one for 24 days. $130 is the floor so far, which is not the same as a floor. That's 20% of the $639 MSRP. Prices have been steady this month.
Lowest now
$175
MSRP
$349
-50% vs MSRP
Prices are rising
Used prices have been rising recently. Prices are up 25.0% over the last 30 days. The 90-day low was $140, $35 below today. Currently 50% of the $349 MSRP.
Specs side by side
| Sigma 90mm f/2.8 DG Contemporary (Sony E) | Tamron 20mm f/2.8 Di III OSD (Sony E) | |
|---|---|---|
| Brand | Sigma | Tamron |
| Family | Sigma | Tamron |
| Category | lens | lens |
| Body type | — | — |
| Mount | Sony FE | Sony FE |
| Sensor | — | — |
| Megapixels | — | — |
| Lens type | prime | prime |
| Focal length | 90mm | 20mm |
| Aperture | f/2.8 | f/2.8 |
| Weight | 295 g | 220 g |
| Filter thread | 55mm | 67mm |
| Length | 62 mm | 64 mm |
| Diameter | 64 mm | 73 mm |
| Construction | — | — |
| Released | 2025-02-24 | 2020-01-30 |
| Discontinued | — | — |
| Status | current | current |
| MSRP | $639 | $349 |
| Current low | $130 | $175 |
| vs MSRP | -80% | -50% |
Both cameras appear in
Curated best-under lists where both of these qualify today.
The verdicts above describe price timing. They don't tell you which camera fits your shooting style. See /methods for how we normalize seller conditions and compute the deal score.