TAMRON 12-20mm f/2.8 Di III - Lens review and specs

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Sony E Nikon Z Wide Angle Zoom full-frame 2026

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Compare with

12-20mm

Focal length

f/2.8

Max aperture

570 g

Weight

14mm35mm85mm200mm600mm

▲ 12-20mm

Max aperture

f/1.8

f/2.8

f/5.6

Constant Aperture

Focal length16 mm

12 mm20 mm

Aperturef/2.8

f/2.8f/16

Near focus2' 3"

Far focus3' 11"

Total DOF1' 8"

Hyperfocal10' 5"

Subject distance2' 10"

Focal length16 mm

Aperturef/2.8

SensorFull Frame

Illustrative scene preview based on this lens's focal length, aperture, and sensor coverage.

This preview uses 16mm, f/2.8, and Full Frame. Subject distance is estimated to keep lens previews comparable.

Min aperture: f/16
Diaphragm blades: 12

Optics

Optical construction: 17 elements in 12 groups
Special elements: 1 XGM element, 3 LD elements and 2 GM elements
Coatings: AX Coating, BBAR-G2 Coating and Fluorine Coating

Focusing

Minimum focus: 18 cm
Max magnification: 0.172×
AF motor: VXD linear motor

Physical

Weight: 570 g
Dimensions: ⌀90mm × 119mm
Hood included: Yes
Color: Black

Recommended Use

Ideal for: Architecture, astro, Landscapes, Travel

Release year: 2026
Announced: Jul 15, 2026

The best

Full-frame 12-20mm f/2.8 ultra-wide zoom for landscapes, architecture, interiors and astrophotography.

Also

A084 combines Sony E and Nikon Z support, 17 elements in 12 groups and an integrated rear filter holder.

Summary

The TAMRON 12-20mm f/2.8 Di III is an ultra-wide zoom for full-frame mirrorless cameras. It covers 12mm to 20mm with a constant f/2.8 maximum aperture, giving photographers an unusually wide field of view while preserving the speed expected from a serious low-light zoom. Support for Sony E and Nikon Z systems makes it relevant to full-frame mirrorless users who need a wider perspective than a conventional 14-24mm or 16-35mm lens can provide.

The specification makes the lens especially relevant for landscape, architecture, interiors, nightscapes and astrophotography. It provides a 121°58′ to 94°30′ diagonal angle of view on full frame, an optical construction of 17 elements in 12 groups, a 12-blade circular diaphragm and a 0.18m minimum object distance at the wide end. The 1:5.8 maximum magnification at 12mm gives it useful foreground exaggeration, so close subjects can remain large while the background stays expansive.

In practical terms, the TAMRON 12-20mm f/2.8 Di III is aimed at photographers who need a bright ultra-wide zoom that remains portable enough for travel, mountain landscapes, city interiors and location work. The Sony E version is about 119mm long and 570g, with a 90mm maximum diameter; instead of a conventional front filter thread, it uses an integrated rear filter holder. That tradeoff supports the extreme 12mm coverage, but it also means filter handling is different from standard wide zooms.