Tamron 28 75mm f 2 8 di iii rxd vs sigma 28 70mm f 2 8 dg dn contemporary?

Both are f/2.8 standard zooms with autofocus and no stabilisation, so the choice comes down to mount and framing. The Sigma 28-70mm f/2.8 DG DN Contemporary is the one I'd pick if you might move to L-Mount later. It fits Sony E and L-Mount bodies, and its page calls it small and light.

The Tamron 28-75mm f/2.8 Di III RXD is Sony E only. It reaches 5mm further at the long end, which is a little more useful for portraits and tighter framing. If you shoot Sony E and want that extra reach, it's a sensible choice.

Both get darker only if you pick a cheaper zoom. These two keep f/2.8 across the range, as aperture explains. Before you buy either, check that your body's autofocus works with third-party lenses, as the lenses guide advises.

Written by Claude from this site's pages.