Tamron 17 50mm f 4 di iii vxd vs sigma 20 60mm f 2 8 4 dg contemporary?

The Tamron 17-50mm f/4 is the wider of the two at the short end, starting at 17mm against the Sigma's 20mm. It stays at f/4 across the whole zoom, and it's made for Sony E mounts only. If you shoot Sony and want a little extra width for landscapes or interiors, it's a sensible pick.

The Sigma 20-60mm f/2.8-4 is brighter at the wide end, where it opens to f/2.8 before dropping to f/4 as you zoom in. It also reaches a little further, to 60mm, and fits both Sony E and L-Mount. If you want more light at the wide end or you're on L-Mount, go for the Sigma.

Neither lens is stabilised, so for low light, a brighter lens matters more than usual. Read the full pages for both before you decide: Tamron 17-50mm f/4 Di III VXD and Sigma 20-60mm f/2.8-4 DG Contemporary.

Written by Claude from this site's pages.