New
Tamron Di III F050 20mm
Focal length 20mm
Aperture f/2.8
Mount Sony E
Weather Sealed Yes
Weight 227 g
af type OSD
lens type prime
74 Overall Score
Price ¥49,848
Snapshot
Pros & Cons
Pros
- Strong macro (93rd percentile) 93rd
- Strong build (89th percentile) 89th
- Strong aperture (86th percentile) 86th
- Strong bokeh (84th percentile) 84th
Cons
- Below average versatility (34th percentile)
What owners think
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews - so you can see whether early praise held up.
Owner sentiment has held steady over time
Based on 24 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
Specifications
Full Specifications
Optics
| Type | Prime |
| Focal Length Min | 20 |
| Focal Length Max | 20 |
| Elements | 10 |
| Groups | 9 |
| Coating | Fluorine coating, Broad-Band Anti-Reflection coating |
Aperture
| Max Aperture | f/2.8 |
| Min Aperture | f/2.8 |
| Constant | Yes |
| Diaphragm Blades | 7 |
Build
| Mount | Sony E |
| Format | full-frame |
| Weather Sealed | Yes |
| Weight | 0.2 kg / 0.5 lbs |
| Filter Thread | 67 |
AF & Stabilization
| AF Type | OSD |
| Stabilization | No |
Focus
| Min Focus Distance | 119 |
| Max Magnification | 1:2 |
vs Competition
| Spec | Tamron Di III F050 20mm | Nikon NIKKOR Z 17-28mm f/2.8 | Sigma Contemporary 10-18mm f/2.8 DC DN | Sony G SELP28135G.SYX | Fujifilm XF 18mm f/1.4 R LM WR | Canon RF 15-35mm f/2.8L IS USM |
|---|---|---|---|---|---|---|
| Focal Length | 20mm | 17-28mm | 10-18mm | 28-135mm | 18mm | 15-35mm |
| Max Aperture | f/2.8 | f/2.8 | f/2.8 | f/4 | f/16 | f/22 |
| Mount | Sony E | Nikon Z | Sony E | Sony E | Fujifilm X | Canon RF |
| Stabilization | false | false | false | true | false | true |
| Weather Sealed | true | true | true | true | true | true |
| Weight (g) | 227 | 450 | 260 | 420 | 370 | 840 |
| AF Type | OSD | Stepping Motor | Autofocus | SSM | Linear motor | Nano USM |
| Lens Type | prime | zoom | zoom | zoom | prime | zoom |
| Compare | Compare | Compare | Compare | Compare |
| Product | AF | Bokeh | Build | Macro | Optical | Aperture | Versatility | Social Proof | Stabilization |
|---|---|---|---|---|---|---|---|---|---|
| Tamron Di III F050 20mm | 54.6 | 83.5 | 89.4 | 93.2 | 51.7 | 85.8 | 33.6 | 58.3 | 37.9 |
| Nikon NIKKOR Z 17-28mm f/2.8 Compare | 86.9 | 88.1 | 73.6 | 86.3 | 86.9 | 85.8 | 68.1 | 64.6 | 37.9 |
| Sigma Contemporary 10-18mm f/2.8 DC DN Compare | 54.6 | 83.5 | 87.3 | 93.3 | 81.6 | 85.8 | 69.1 | 68.8 | 37.9 |
| Sony G SELP28135G.SYX Compare | 94.2 | 80.2 | 75.5 | 31.2 | 86.9 | 69.9 | 92.3 | 50.2 | 92.8 |
| Fujifilm XF 18mm f/1.4 R LM WR Compare | 98 | 41.2 | 79.4 | 84.1 | 83.4 | 45.8 | 33.6 | 87.9 | 37.9 |
| Canon RF 15-35mm f/2.8L IS USM Compare | 94.2 | 25.9 | 46.9 | 39.8 | 90.2 | 22.6 | 75.8 | 98.2 | 96.6 |
Price
Value & Pricing
From ¥49,848
Amazon.co.jp 1 offer From ¥49,848
We started tracking prices for this product on Jul 22, 2026. The chart appears once we have more data.
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
