Viltrox 50mm F/1.8 lens covers both E-mount and Z-mount system. This one is mainly designed for Nikon Z-mount mirrorless cameras featuring internal focus, linear aperture and video optimization. The STM stepper motor provides smooth and quiet focusing performance on filmmaking or videography while the large aperture allows stunning captures even in low-light situations. With a naked-eye 50mm focal length, it's a perfect lens for portraits, vlog, still photography, etc.