Tamron 20mm F2.8 Di III OSD M1:2 vs Sigma 20mm F2 DG DN | Contemporary 022
Both are Sony E prime lenses for full frame. Here is what actually differs.
Pick the Tamron 20mm F2.8 Di III OSD M1:2 if
- You want the lighter lens to carry: 150 g lighter (220 g vs 370 g)
- You shoot close-ups: it focuses down to 0.11 m vs 0.22 m
- You want bigger close-ups: 0.5× vs 0.15× maximum magnification
- Our notes say it suits: Street, landscape, close-up details
Pick the Sigma 20mm F2 DG DN | Contemporary 022 if
- You need 1 stop more light for low light or background blur (f/2 vs f/2.8)
- You shoot video: Stepping motor autofocus is smooth and quiet (the Tamron 20mm F2.8 Di III OSD M1:2 uses OSD)
- You care about the shape of out-of-focus highlights: 9 aperture blades vs 7
- You prefer a newer design: released 2022 vs 2020
- Our notes say it suits: Landscape and astro, street and travel, interiors
Spec differences
13 differences| Tamron 20mm F2.8 Di III OSD M1:2 | Sigma 20mm F2 DG DN | Contemporary 022 | |
|---|---|---|
| Brand |
Tamron
|
Sigma
|
| Max aperture |
f/2.8
|
f/2
1 stop faster
|
| Weight |
220 g
lighter
|
370 g
|
| Length |
64 mm
shorter
|
74.4 mm
|
| Diameter |
73 mm
|
70 mm
slimmer
|
| Filter thread |
67 mm
|
62 mm
|
| Min focus distance |
0.11 m
closer
|
0.22 m
|
| Max magnification |
0.5×
larger
|
0.15×
|
| Aperture blades |
7
|
9
more blades
|
| Optical design |
10 elements / 9 groups
|
13 elements / 11 groups
|
| Autofocus motor |
OSD
|
Stepping motor
|
| Weather sealing |
Yes
|
not listed
|
| Released |
2020
|
2022
|
5 identical specs hidden: mount, type, format, focal length, image stabilization. Show all
- Mount
- Sony E both
- Type
- Prime both
- Format
- Full frame both
- Focal length
- 20mm both
- Image stabilization
- No both
Our notes
Tamron 20mm F2.8 Di III OSD M1:2
A small wide-angle prime for Sony full-frame with 1:2 close-up capability. It weighs about 220 g and uses an OSD focus motor.
Pros
- Compact at about 220 g
- Close focusing to 1:2
- 67mm filter thread
Cons
- f/2.8 is slow for low light
- No stabilization
Our notes
Sigma 20mm F2 DG DN | Contemporary 022
A compact wide-angle prime for full-frame mirrorless in Sigma's I series, with a metal body and aperture ring. It offers an f/2 aperture.
Pros
- Metal construction
- Aperture ring
- Compact at about 370 g
Cons
- f/2 is slower than f/1.4 options
- Some vignetting wide open
More comparisons
Tamron 20mm F2.8 Di III OSD M1:2 vs Voigtlander Color-Skopar 20mm f/3.5 SL II
Tamron 20mm F2.8 Di III OSD M1:2: ⅔ stop faster, street
Sony FE 20mm F1.8 G vs Sigma 20mm F2 DG DN | Contemporary 022
⅓ stop faster vs newer (2022)
Sony FE 20mm F1.8 G vs Tamron 20mm F2.8 Di III OSD M1:2
1⅓ stops faster vs 153 g lighter
Sigma 20mm F2 DG DN | Contemporary 022 vs Tamron E 20mm F2.8 F050
1 stop faster vs 150 g lighter
Tamron 20mm F2.8 Di III OSD M1:2 vs Viltrox 20mm f/2.8
focuses closer vs 63 g lighter
Sigma 20mm F2 DG DN | Contemporary 022 vs Voigtlander Color-Skopar 20mm f/3.5 SL II
Sigma 20mm F2 DG DN | Contemporary 022: 1⅔ stops faster, landscape and astro