Sigma's outstanding budget fast prime for Sony APS-C — f/1.4 at 45mm equivalent with stepping motor AF.
The Sigma 30mm f/1.4 DC DN Contemporary (2016) delivers f/1.4 speed at a 45mm equivalent on Sony APS-C for remarkably little money. It quickly became the default fast prime recommendation for Sony APS-C shooters — outstanding image quality at budget pricing.
Excellent sharpness for the price — genuinely impressive from f/2. Smooth bokeh. Stepping motor AF is quiet and fast. 30cm close focus. Contemporary designation — compact, lightweight, affordable. 265g.
Sony E mount, 52mm filter thread. APS-C only. Stepping motor AF. 265g. 30cm close focus. Also available in MFT, L-Mount, Canon EF-M, Canon RF-S, and Fujifilm X mounts.
Very common and cheap used. Nothing critical to check — well-built for the price. The 30mm f/1.4 DC HSM Art is the DSLR equivalent. Outstanding value — one of the best budget fast primes for any system.