The samyang 75mm t38 umc is a sophisticated wide angle fisheye lens designed for cameras with micro four thirds sensor 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 brightness of the lens corr