The Nikon 16mm f2.8 Fisheye-Nikkor is, as you may have guessed, a fisheye lens. It records a 170 degree image from corner to corner with all the circular distortion you'd expect from a fisheye. But it's a full-frame fisheye, so it will produce an edge-to-edge image that takes full advantage of your sensor's resolution. In excellent cosmetic condition, with very minor paint wear. Glass is free of haze and fungus, with only minor dust; there are a few front element coating marks which do not affect imaging. This is a later pre-AI version with an OEM AI conversion.