This image was captured with a 1970s Nikkor 8mm f/2.8 MF fisheye lens with a Nikon D2 DX camera. Full frame or FX image would be round. I use 40 years of nikkor lenses, non AI, AI, and AIS through the current AF, AFS, G, & E versions. Some of the old ones resolve very well on my D850 45 megapixel camera.