viltrox VILTROX 20mm F2.8 Auto Focus STM Full Frame Prime Lens for Sony E-Mount Cameras Written by admin on January 4th, 2024. Viltrox 20mm F2.8 AF STM for Sony FE, 157g Lightweight Wide Angle Full Frame Auto Focus Prime Lens with Large Aperture f/2.8 for Sony E-mount Camera a7CR a7C a7CII a6700 ZV-E100 a6400 a6600 a7III a7IV.