The samyang 12mm t31 ed as ncs manual focus fisheye lens for cinematography features excellent optics and a de clicked manual aperture ring for silent precise focus adjustment and use with video rigs with follow focus systems the lens provides a 180deg angle of view and bright t31 aperture to allow more control over depth of field and maximise light transmission to ensure natural looking shots in low light situations the distance scale and t numbers are marked on both sides of the lens for