Tamron 20mm F/2.8 Di III OSD MF/2

Specifications01

MountSONY FE

Focal length20mm

Max aperturef/2.8

TypeCinema · Wide · Prime

Weight221 g

Filter size67 mm

Physical length73 mm

Min focus distance0.11 m

Max magnification0.5

Aperture blades7

Optical elements9

Groups8

Lens hoodbarrel-shaped with frame window (bayonet mount, supplied)

Additional Info02

Category["Sony","Sony FE (Full Format)"]

Keywords["E-mount","Prime","Tamron","Ultra-wide"]

Review AuthorKlaus

Other Featuresdust & moisture resistant

Review VerdictThe Tamron 20mm f/2.8 Di III OSD M1:2 is a bit of a complicated being. Obviously, it's not meant to be used without image auto-correction. Especially the massive (unusable) barrel distortion requires countermeasures. With all corrections in place, the center performance of the lens is just outstanding but there's a sharp drop in resolution towards the outer image field at f/2.8. The quality of the outer image field improves when stopping down and is decent albeit unimpressive at medium aperture settings. Lateral CAs are low. There is some vignetting at f/2.8 even with auto-correction but it's an acceptable compromise and fairly well-controlled when stopped down. The quality of the bokeh is good for an ultra-wide lens. If you have read our reviews of its cousins, you know already that we aren't all that thrilled by the build quality. The rather mediocre plastics and sluggish AF don't scream quality. However, in all fairness - this has to be seen relative to the low price tag. Keeping this in mind, it's almost surprising that the lens features some degree of sealing against moisture as well as an impressive close focus capability with an object magnification ratio of up to 1:2. Overall, the Tamron 20mm f/2.8 Di III OSD M1:2 is a good lens for a great price but it's not an obvious choice.

Review Published2021-08-04T09:39:00+00:00

Optical Construction9 elements in 8 groups inc. 1x aspherical and 3x LD elements

Field Notes02

Tamron 20mm f/2.8 Di III prime lens for Sony E/FE full-frame, designed for wide-angle photography with manual focus and autofocus (OSD). Suitable for landscapes, interiors, and low-light wide shots.

AI-assisted summary — verify against linked sources

Catalog note · source: opticallimits