This is 12mm on Full Frame – Personal review of Sigma 12-24mm f/4.5-5.6 EX DG ASP HSM II – Caught In Pixels
7artisans 12mm T2.9 Aps-c Cine Lens Large Aperture Wide Angle For Sonye Fuji Fx Red/canon Rf Nikon Z Panasonic M43 Leica/sigma L - Camera Lenses - AliExpress
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File:20120907 Sigma on a full frame at 12mm.JPG - Wikimedia Commons
Sigma 12mm Fisheye Produced/branded Beroflex 1960s – Sigma UK