Hybrid aspherical lens (H-ASP)- Ultra Multi Coating (UMC) of Samyang Optics- Uncoupled aperture and focus gear ring- VDSLR II CINE LENS Semi-telephoto Manual Focus Cine Lens Samyang Optics 85mm T1.5 VDSLR AS IF UMC II 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 II is carefully designed for professional film and video works so the focus gear ring is installed for follow focus system. You may change the aperture quietly 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. Hybrid aspherical lens (H-ASP) has a specially designed curved surface to minimize color aberration and realize exceptional image quality and high contrast throughout center to corner of image even when aperture is fully opened. Samyang 85mm T1.5 II is an inner focus lens. The length of lens does not change when focusing so it is dustproof. Ultra Multi Coating (UMC) technology of Samyang Optics optimizes the light penetration and minimizes flare and ghost. There are 8 aperture blades designed to be almost as a full circle when aperture is closed which expresses starlike ray clearly and beautifully.