Konica's specialist AR fish-eye — the ultra-coated 15mm f/2.8 Hexanon with full curved-horizon rendering.
The Konica UC Fish-eye Hexanon AR 15mm f/2.8 was a full-frame fish-eye wide-angle for the Konica AR bayonet, the mount used across Konica's Autoreflex SLR bodies. The UC prefix marked Konica's ultra-coated line, and this sat at the widest end of the AR range as a specialist optic for photographers wanting the curved-horizon fish-eye look.
This is a manual-focus lens for the Konica AR mount with a 15mm focal length and a maximum aperture of f/2.8. As a fish-eye it projects an extremely wide angle of view with the pronounced barrel distortion characteristic of the design. Beyond the verified focal length and aperture, remaining optical details are not confirmed here and are left out rather than guessed.
A fish-eye at this focal length delivers a very wide field with strong curvilinear distortion that bends straight lines away from the centre. It suits creative wide interiors, dramatic skies and architectural abstraction where the fish-eye rendering is used deliberately rather than corrected, and works for close-in group and event scenes.
On the used market Konica fish-eye Hexanons are uncommon and command a premium among AR-mount collectors. Check the front element for scratches, haze and internal fog, confirm the aperture blades move cleanly without oil, and test the focus helicoid for smoothness. Adapting the AR mount to mirrorless is possible but the short AR flange makes DSLR adaptation with infinity focus difficult.