Tamron 20mm f/2.8 Di III OSD M1:2 : Specifications and Opinions

Tamron 20mm f/2.8 Di III OSD M1:2, front

The Tamron 20mm f/2.8 Di III OSD M1:2 is a wide-angle lens for FF and APS-C, manufactured from 2020. The focus is done by Stepper Motor, it does not have image stabilization. The average price, when it has been added to the JuzaPhoto database, is 210 €;

14 users have given it an average vote of 8.9 out of 10.

MOUNT

This lens is available with the following mounts:

Sony E: this lens is compatible with mirrorless fullframe and APS-C Sony.

Specifications
Focal lenght	20 mm
Angle of view	94.4°
Format	FF, APS-C
Max. aperture	f/2.8
Aperture blades	7
Lenses/Groups	10 elements in 9 groups
Min. focus distance	0.11 meters
Reproduction ratio	0.50x
Features
Stabilization	No
Focus	Stepper Motor
Internal Focus	Yes
Built and notes
Tripod ring	No
Extenders	No
Filters	67 mm
Lens hood	Yes, supplied
Weather sealing	Yes
Weight	220 g
Dimensions	73 x 64 mm
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Reviews

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The following opinions have been automatically translated with Google Translate.

Diego Camorani

sent on 01 Febbraio 2026

Pros: Weight 0.50X

Cons: for what it costs nothing.

Opinion: I would call this Tamron 20mm f2.8 a versatile lens, in fact in addition to being a light, bright and cheap wide angle with that 0.5x reproduction ratio, it allows me to do ambient macros and with a very small minimum focusing distance. The image quality is good but not excellent but with € 200 you can't expect more. Brava Tamron rating 9

Robysc

sent on 24 Settembre 2023

Pros: Dimensions, Weight, Sharpness

Cons: Low Light AF, Distortion (pp resolveable)

Opinion: Taken to have a lightweight lens on A7rii. Even at full aperture offers a good sharpness in more c, is the possibility of making macro given the minimum focusing distance. Tried in low light conditions it is sometimes uncertain while for distortion with a few clicks it resolves in pp. In conclusion, if you are looking for a really light optics at a low price with more than satisfactory performance this is unrivaled.

Jazzcocks

sent on 14 Maggio 2023

Pros: Price, optical quality, colors

Cons: Distortion? AF not very fast.

Opinion: This Tamron series (I also tried the 35mm) offers a lot at a very low price. The image quality is excellent, for sharpness, colors, backlight tightness. In this 20mm, however, there is a moderate drop in sharpness at the edges, noticeable on 42 mpx. Forgivable anyway for a wide angle. The distortion is high, but it corrects well with the profile incorporated in the lens. My specimen has well-aligned lenses, there are no shifts or tilts. It is a lens that I would recommend unreservedly. I hope Tamron continues with this series with a unique q/p ratio, it would be interesting a 15mm and in the canvases a 135mm.

Joevittorio

sent on 31 Ottobre 2021

Pros: Compactness and sharpness and tropicalization

Cons: Distortion quite accentuated, but solvable in post or in the room

Opinion: I bought this Tamron 20mm f/2.8 to replace the Sigma 20mm Art, the latter a lens with exceptional sharpness and free of any defects. Being a passionate travel photographer, the Sigma despite its merits, its weight makes it unsuitable for those like me who are used to carrying the camera over the shoulder for many hours, "it breaks your neck of how heavy it is!" So I decided to reluctantly sell the sigma to buy the Tamron 20mm. The first thing that catches the eye is certainly the design with attention to every detail, although the construction is made of typical Tamron plastic, you can understand it by holding it in your hand. Another interesting aspect is the rubber gasket that makes it tropicalized, ideal for photographing in all weather conditions. A further pleasant surprise was the weight, a feather when compared with the Sigma. Mounted on my Sony a7iii, it seems not to even notice that I have it on my back. After taking some test shots, I noticed with great relief an excellent focus, despite being a bit noisy, but almost always ready and fluid, I would say like my 50mm Sony. Even its sharpness at full aperture of the aperture proves to be quite detailed on almost the entire frame, while to get the maximum detail you have to go down from f / 4 to about f / 11. On the other hand, the distortion is quite evident, if you compare it with the Sigma 20mm Art, but nothing that can not be corrected either in the camera if you shoot in JPG, or in a completely automatic way with Lightroom. What can I say, considering the price I would say that it has no competitors able to match it at the same price, I have had the Sigma Art for about 6 months and I can assure you that this lens is really impressive.

Emmegreco

sent on 21 Giugno 2021

Pros: Build quality, sharpness, weight and portability

Cons: Exaggerated distortion

Opinion: I used this beautiful 20mm of Tamron in interior photography but the distortion of this lens is really impossible. As everyone has pointed out, this defect is compensated directly in the machine or through a software profile but to have all the images crop, in environments where you fight with mm to compose the frame, is not possible. If you make landscapes and streets you will not even notice the defect but for narrow spaces you will see its limits.

There are 6 more reviews. Show all »

Photos taken with Tamron 20mm f/2.8 Di III OSD M1:2

The Red of Lake Maggiore.

by Francesco.Santullo
131 comments, 5605 views

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He saw the light.

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7 comments, 3315 views

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6 comments, 3544 views

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Ghent

by Joevittorio
9 comments, 1238 views

Untitled Photo

by Daniele Brescini
11 comments, 992 views

Untitled Photo

by Xxand85xx
4 comments, 2946 views

The Plain of Castelluccio

by Xxand85xx
7 comments, 2011 views

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13 comments, 716 views

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15 comments, 1600 views

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9 comments, 612 views

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by Simolucca
8 comments, 532 views

Castello del Boccale Livorno

by Robysc
6 comments, 565 views

Overflow MUcchiola

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1 comments, 1036 views

Alba to Alassio

by Alexey
5 comments, 759 views

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2 comments, 664 views

Castello del Boccale Livorno

by Robysc
1 comments, 521 views

Tree at sunset

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2 comments, 535 views

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3 comments, 651 views

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by ValterP
6 comments, 500 views

Untitled Photo

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0 comments, 702 views

Essouira

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6 comments, 477 views

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2 comments, 420 views

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by Xxand85xx
3 comments, 1257 views

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Sunset over the Marche hills

by Daniele Brescini
4 comments, 521 views

The Naked Man

by ValterP
10 comments, 473 views

Hedgehog

by Andrea Zannoni
2 comments, 562 views

Hepatica nobilis

by Daniele Brescini
5 comments, 463 views

Fabiola

by Robysc
1 comments, 565 views

The Valley of the Brigands

by ValterP
5 comments, 648 views

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Tamron 20mm f/2.8 Di III OSD M1:2 : Specifications and Opinions

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Photos taken with Tamron 20mm f/2.8 Di III OSD M1:2