Viltrox AF 40mm F2.5 Air FE

Testers found it sharp across most of the frame from f/2.5, with weaker but acceptable edges and corners and only slight barrel distortion. Lateral colour fringing toward the edges is easily corrected in camera, and bokeh is smooth without onion rings despite the 7-blade aperture.

AF is fast, nearly silent and tracks well with face/eye detection. The build is basic plastic over a metal mount, with no aperture ring, AF/MF switch or sealing. Most reviewers call it outstanding value.

Owners use it as a light walkaround and street lens and are pleased with the image quality for the price. The white version and the small petal hood are popular.

Some mention a plasticky feel, slower AF in low light, and that f/2.5 limits subject separation. A few report early quality-control or shipping issues.