A stepping motor (STM) is used to drive the autofocus and the lens features a minimum focusing distance of 80cm (2.62ft). The front filter size is 72mm and integrated contacts power the aperture mechanism and deliver EXIF data to compatible Sony cameras. Viltrox 85mm f1.8 lens, which has an aperture range of F1.8 to F16, is designed for full-frame Sony cameras but also works as a 127.5mm equivalent on APS-C cameras. It's constructed of ten elements in seven groups, including one extra-low dispersion element and four specialty elements made from 'highly transparent glass,' which reduces aberrations and improves color rendering. Bright f/1.8 maximum aperture benefits working in difficult lighting conditions, HD Nano multi-layer coating has been applied to individual elements to reduce flare and ghosting The lens is an integrated micro USB port located on the rear metal mount of the lens. This connector is used to upgrade the lens' firmware. VILTROX 85mm f/1.8 F1.8 Mark II Full-Frame Lens Auto Focus for Sony Camera, Fits for Sony E-Mount Camera A7II A7III A7RIII A7SIII A7II A7RIV A9 A6600 A6500 A6400 A6300 A6100 A6000 A5100 A5000 A7C A7R The 85mm focal length is a perfect choice for portrait photography as the maximum F1.8 aperture opens up a world of beautiful prime-lens bokeh. The large F1.8 maximum aperture enables beautiful defocusing effects and enables massive amount of light for low-light or dimly-lit shooting scenarios. Capture beautiful portraits with this affordable 85mm F1.8 full-frame E-mount mid-telephoto prime lens. This compact, lightweight lens is ideal for both full-frame and APS C cameras. The 9-blade fast F1.8 aperture delivers beautiful background defocus effects while the dust and moisture-resistant design offers robust reliability. (camera body shown sold separately) Features: Support Auto Focus and Electronic Aperture Noiseless STM focus motor, brings precise and smooth focus Support Full Frame,85mm focal length, F1.8 large aperture Refined optical design,10 elements in 7 groups, including 1 ED lens and 4 short wavelength and high transparent lens HD Nano multilayer coating Precision metal structure Support firmware upgrade