Its 180-degree diagonal field of view on full-frame sensors and a close 150mm minimum focus distance enable dramatic, distorted perspectives with subjects nearly touching the front element. The constant f/2.8 aperture and lightweight 370g build make it a practical, creative tool without the bulk of modern ultra-wide zooms. This lens is best for wedding and underwater photographers seeking an affordable, auto-focus fisheye to produce artistic, eye-catching images.