Canon's New FD circular fisheye — the 7.5mm f/5.6 projecting a round 180-degree image.
The Canon New Fish-Eye 7.5mm f/5.6 arrived in 1979 as the New FD generation revision of Canon's circular fisheye for the FD manual-focus mount. It carried over the circular fisheye design into the lighter, black-barrelled New FD styling with the redesigned bayonet locking system, remaining the widest fisheye option in the FD catalogue.
This is a manual-focus Canon FD lens with a fixed 7.5mm focal length and a maximum aperture of f/5.6. It projects a circular 180-degree image inside the frame rather than filling it, and uses built-in filters chosen by a turret rather than a conventional screw-in front filter. Aperture and focus are set by hand on the New FD barrel.
As a circular fisheye it delivers the round image and pronounced barrel distortion typical of the type, with straight lines curving strongly away from the centre. It is used for deliberate creative effect in interiors, skies and immersive wide scenes, and the very short focal length gives extremely deep depth of field throughout the aperture range.
On the used market this is a specialist New FD optic and less common than standard focal lengths, so verify the filter turret rotates freely and the exposed front element is unmarked. Inspect for internal haze, fungus and sticky aperture blades typical of the era, and confirm the New FD mount ring turns and locks correctly. It can be adapted to mirrorless with an optics-free FD adapter.