APS-C Format - f/1.2 to f/16, 40.5mm (Full Frame Equivalent), Excellent Low Light Performance, STM Stepping Motor, All-Metal Lens Housing, 15 Elements in 11 Groups, Weather Resistant Design, Minimum Focusing Distance: 11", Weight: 1.2 lb, 67mm Filter Size This Viltronix 23mm f/1.2 AF Lens for FUJIFILM X-mount mirrorless cameras is a fast portrait-length prime featuring advanced autofocus performance a sophisticated optical design along with professional handling and reliability. Offering a large maximum aperture and shallow depth of field this lens provides excellent low-light performance and exceptionally sharp image quality. A newly designed STM stepping motor provides fast and precise autofocus performance and an easily accessible MF/AF switch enables you to quickly switch back and forth between manual and automatic focusing modes. Additionally the lens also supports eye and face autofocus animal autofocus and additional automatic focusing modes. Robustly built the lens showcases an all-metal lens body in a weather-resistant design and metal electronic contacts support Exif information transmission.