Is the sigma 85mm f 1 4 dg dn art good for portraits?

Yes, on a full-frame body it's a strong portrait lens. An 85mm is the classic portrait focal length here: it gives flattering perspective, a comfortable working distance, and soft backgrounds at f/1.4. It's made for Sony E and L-Mount, and it's autofocus but not stabilised, so pair it with a body that has in-body stabilisation if you shoot handheld in dim light.

On APS-C it frames like about 128mm, which is quite tight for most portraits, so it's better suited to full frame. If you're on APS-C, a 56mm f/1.2 to f/1.4 does the same job more comfortably.

For the reasoning behind the focal length, see Portraits.

Written by Claude from this site's pages.