Viltrox has released its new 85mm F1.8 STM autofocus prime lens for Nikon Z-mount mirrorless camera systems.

The autofocus lens is constructed of 10 elements in 7 groups, including five ‘short wave length and high transparency’ elements and one low-dispersion element. Viltrox claims the lens, which uses a stepping motor (STM) to drive the autofocus elements, features full autofocus support, including compatibility with Nikon’s Eye-AF technology. Other features include an aperture range of F1.8–16, a nine-blade aperture diaphragm, an 80cm (31.5″) minimum focusing distance and a 72mm front-filter thread.

Viltrox has also included an onboard micro USB port for updating the lens’ firmware. The lens measures in at 92mm (3.62″) long, 80mm (3.15″) in diameter and weighs 540g (1.2lbs).

The lens is currently available to purchase on Amazon for $399. That’s $300 less than the MSRP of Nikon’s own Nikkor Z 85mm F1.8 S lens.