Viltrox AF 135mm F1.8 LAB FE

Lab tests found centre resolution excellent wide open and the whole frame at its best around f/4–f/5.6, with negligible lateral CA, very low bokeh fringing and only about 1.4 EV of vignetting at f/1.8. Bokeh is smooth with a mild cat's-eye effect toward the corners, and several testers rate it close to the Sony GM optically.

Autofocus is quiet, accurate and fine for portraits, weddings and moderate action, but it is not as quick as Sony's XD linear motors for sport. The size and weight, about 1.2–1.3kg, are the most common complaint.

Owners describe it as a GM-class portrait lens at a third-party price and praise how clean the out-of-focus areas look at f/1.8. The build quality and the extra controls surprise people coming from older Viltrox lenses.

The complaints are weight and front-heaviness on small bodies, a lens display that some consider a gimmick, and occasional firmware-related AF quirks that later updates fixed.