Sigma 19mm f 2 8 dn art vs ttartisan af 17mm f 1 8 air?

Both are wide APS-C primes, so the choice comes down to your camera mount and how much light you need.

The TTArtisan AF 17mm f/1.8 Air is the one I'd pick if you want a brighter lens. At f/1.8 it gives noticeably more background blur than the Sigma, and it fits Sony E, Fujifilm X and Nikon Z mounts.

The Sigma 19mm f/2.8 DN Art is the cheap, light option, and it's the one to consider if you shoot Micro Four Thirds, since the TTArtisan doesn't fit that mount. It frames a little tighter than the 17mm.

If you're unsure how f-numbers translate across sensor sizes, the focal length converter explains it.

Written by Claude from this site's pages.