This fisheye lens with an 180° diagonal view can impart an extraordinary expressiveness to photographs. Even under conditions where manual focus world be difficult, the autofocus delivers sharp focus quickly and accurately. Fisheye lenses are in a class of their own for specialized photographic situations, demostrating their unique perspective and hyperfocal effect when photographing objects as close as 0.2m / 0.7ft. from the focal plane. The rear drop-in gelatin filter holder makes for easy filter work.