Samyang 85mm T1.5 AS IF UMC is a bright prime lens that has been designed to work with both full-frame and APS-C cameras. VDSLR Samyang lenses are fitted with racks compatible with the Follow Focus system. This solution allows for effortless and accurate rotation of focus and aperture rings. The aperture ring is rotated smoothly and noiselessly. These modifications allow for extremely comfortable and effective control of focal plane and depth of field during filming.