This lens is fully manually controlled - both aperture and focus are controlled on the lens and there are no electronics. The aperture ring is de-clicked, so there are no hard stops when changing the aperture. The lens is suitable for full-frame sensors and has a filter thread of 72mm. Official Description: Enjoy precise filming with beautiful bokeh Hybrid aspherical lens (H-ASP) Ultra Multi Coating (UMC) of Samyang Optics Uncoupled aperture and focus gear ring VDSLR CINE LENS Semi-telephoto Manual Focus Cine Lens Samyang Optics 85mm T1.5 VDSLR AS IF UMC is a semi-telephoto manual focus cine lens designed for full frame sensor sizes. Cine Lens Features Samyang 85mm T1.5 VDSLR AS IF UMC is carefully designed for professional film and video works so the focus gear ring is installed for follow focus system. You can change the aperture quickly and smoothly with the uncoupled aperture gear ring. Also, distance scale and T numbers are marked on both sides of the lens for convenience. Optical Features As Samyang 85mm photo lens does, this VDSLR lens also has an outstanding optical function. Optical lenses feature 9 lenses in 7 groups... SUMMARY Focal Length: 85mm Max Aperture: T/1.5 Lens Format: APS-C, Full Frame Lens Type: Standard Lens Mount: Sony E Type: Photo, Video Weight: ~2kg