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Amazon.com : Sigma 12-24mm f/4.5-5.6 EX DG IF HSM Aspherical Ultra Wide Angle Zoom Lens for Canon SLR Cameras : Camera Lenses : Electronics
Rokinon 12mm F2 vs. Sigma 16mm F1.4: Which is the best wide angle lens for Sony A6400 - YouTube
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File:20120907 Sigma on a full frame at 12mm.JPG - Wikimedia Commons
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Opto Sigma IH-12R Iris Diaphragm Holder for 12mm Aperture w/ Rod Laser / Imaging | eBay
Sigma 12mm Fisheye Produced/branded Beroflex 1960s – Sigma UK