Samyang 24mm T1.5 ED AS IF UMC is an extremely bright, prime lens designed to work with digital cameras fitted with full-frame or APS-C sensors. 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.