Imagine the idea of a lens that can look behind itself, that’s exactly what a Fisheye-Nikkor 6mm f2.8s can do, delivering a viewing angle of 220-degrees. So what’s this new technology and when did it first arrive? It isn’t new at all actually, the fisheye lens was first introduced at the Photokina trade show in Germany, in the year 1970. This thing is huge, 7-inches long and 10-inches in diameter, wit ha weight over 11 pounds. Imagine trying to comfortably hold this thing while taking a photo.