SUMMARY
The Yongnuo 50mm f/1.8S DF, a full-frame autofocus 50mm lens priced at $135, delivers surprisingly strong performance. Tested on a Nikon Zf, it exhibits notable sharpness even wide open, with corner-to-corner clarity by f/2.8. The lens features a durable build with a metal mount, a USB-C port for firmware updates, and a programmable function button. While autofocus is generally reliable for stills, focus breathing is apparent in video. Flare resistance is a standout feature, holding up well in backlit conditions.
TAKEAWAYS
The Yongnuo 50mm f/1.8S DF is a $135 full-frame autofocus lens.
It offers impressive sharpness and flare resistance for its price point.
Autofocus is reliable for stills, but focus breathing is noticeable in video.
The lens includes a metal mount, USB-C port, and programmable function button.