Tamron - 17-70mm F/2.8 Di III-A VC RXD for Fujifilm X-Mount - B070XThe lens has a maximum aperture of F2.8 throughout its 4.1x focal length range. At every focal length in the 17-70mm range (full-frame equivalent of 25.5-105mm), it offers outstanding optical performance. It is also a small, lightweight lens equipped with a VC mechanism that provides vibration compensation to minimise camera shake. The VC mechanism uses AI technology in video recording. The lens is also equipped with the silent RXD (Rapid eXtra-silent stepping Drive) AF motor and has minimal focus breathing. These two features enable videographers to get better shots with an interchangeable lens system camera. The 17-70mm F/2.8 Di III-A VC RXD is extra versatile with a MOD (Minimum Object Distance) of just 19 centimetres at the wide-angle position. The lens also has a moisture-resistant construction and a fluorine coating, making it weatherproof. The filter size of 67mm is the same as that of most TAMRON lenses for mirrorless cameras. It is a very useful lens that delivers high image quality pictures and video with its fast aperture of F2.8.