The samyang 85mm t15 as if umc ii vdslr is a fast medium telephoto lens designed for shooting high quality video footage on a full frame dslr the gearing on the focus and aperture rings allow you to follow focus and provide you with aperture control from a professional camera rig the aperture ring has also been de clicked which enables smooth iris pulls the focal distance and aperture settings are clearly marked on the side of the lens barrel for convenience the large t15 aperture enabl