Compare lenses

Sony FE 20-70mm f/4 G vs Tamron 17-50mm f/4 Di III VXD

The Sony FE 20-70mm f/4 G and the Tamron 17-50mm f/4 Di III VXD side by side, computed from this guide's catalogue.

Which to pick

Pick the Sony FE 20-70mm f/4 G if you want more reach (to 70mm equivalent). Pick the Tamron 17-50mm f/4 Di III VXD if you want a wider view (from 17mm equivalent).

Still torn? Ask the guide about the Sony FE 20-70mm f/4 G and the Tamron 17-50mm f/4 Di III VXD

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Sony FE 20-70mm f/4 G	Tamron 17-50mm f/4 Di III VXD
Maker	Sony	Tamron
Focal length	20-70mm (zoom)	17-50mm (zoom)
Full-frame equivalent	20-70mm	17-50mm
Maximum aperture	f/4	f/4
Made for	Full frame	Full frame
Mounts	Sony E	Sony E
Stabilised	no	no
Autofocus	yes	yes
Zoom range	3.5×more range	2.9×
Weight	488 g	460 glighter
Cameras it fits	41 in this guide	41 in this guide

Focal range, in full-frame terms

Sony FE 20-70mm f/4 G: 20-70mm.

Tamron 17-50mm f/4 Di III VXD: 17-50mm.

Aperture

Sony FE 20-70mm f/4 G: f/4 wide open.

Tamron 17-50mm f/4 Di III VXD: f/4 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.