Compare lenses

Tamron 20mm f/2.8 Di III OSD M1:2 vs Viltrox AF 20mm f/2.8 Air

The Tamron 20mm f/2.8 Di III OSD M1:2 and the Viltrox AF 20mm f/2.8 Air side by side, computed from this guide's catalogue.

Which to pick

Pick the Viltrox AF 20mm f/2.8 Air if you want a fit on more cameras (82 against 41 in this guide) and a lighter lens (157 g against 220 g). On these specs the Tamron 20mm f/2.8 Di III OSD M1:2 has no clear advantage: choose it if the price, the handling or a lens you own decides it.

Still torn? Ask the guide about the Tamron 20mm f/2.8 Di III OSD M1:2 and the Viltrox AF 20mm f/2.8 Air

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Tamron 20mm f/2.8 Di III OSD M1:2	Viltrox AF 20mm f/2.8 Air
Maker	Tamron	Viltrox
Focal length	20mm (prime)	20mm (prime)
Full-frame equivalent	20mm	20mm
Maximum aperture	f/2.8	f/2.8
Made for	Full frame	Full frame
Mounts	Sony E	Sony E, Nikon Z, L-Mount
Stabilised	no	no
Autofocus	yes	yes
Weight	220 g	157 glighter
Cameras it fits	41 in this guide	82 in this guidefits more cameras

Focal range, in full-frame terms

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

Viltrox AF 20mm f/2.8 Air: 20mm.

Aperture

Tamron 20mm f/2.8 Di III OSD M1:2: f/2.8 wide open.

Viltrox AF 20mm f/2.8 Air: f/2.8 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

Field of view

How wide each sees, at each end, on the sensor it was made for.

Cameras they fit

41 cameras in this guide take both, so either works on the same body. In all, the Tamron 20mm f/2.8 Di III OSD M1:2 fits 41 and the Viltrox AF 20mm f/2.8 Air 82.