Compare lenses

Tamron 20mm f/2.8 Di III OSD M1:2 vs Zeiss Loxia 21mm f/2.8

The Tamron 20mm f/2.8 Di III OSD M1:2 and the Zeiss Loxia 21mm f/2.8 side by side, computed from this guide's catalogue.

Which to pick

Pick the Tamron 20mm f/2.8 Di III OSD M1:2 if you want autofocus and a lighter lens (220 g against 394 g). On these specs the Zeiss Loxia 21mm f/2.8 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 Zeiss Loxia 21mm f/2.8

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	Zeiss Loxia 21mm f/2.8
Maker	Tamron	Zeiss
Focal length	20mm (prime)	21mm (prime)
Full-frame equivalent	20mm	21mm
Maximum aperture	f/2.8	f/2.8
Made for	Full frame	Full frame
Mounts	Sony E	Sony E
Stabilised	no	no
Autofocus	yesautofocus	no, manual focus
Weight	220 glighter	394 g
Cameras it fits	41 in this guide	41 in this guide

Focal range, in full-frame terms

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

Zeiss Loxia 21mm f/2.8: 21mm.

Aperture

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

Zeiss Loxia 21mm f/2.8: 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.