CS Mount Lenses | 4K+ Machine Vision and CCTV Lenses
Ultra Wide-Angle C-Mount Lens for Raspberry Pi HQ Camera - 3.2mm Focal Length | The Pi Hut
Wide Angle Lens, 25mm F1.8 Mini CCTV C Mount Professional HD Wide Angle Lens for Bars/Shops/Parking Lots/Houses/Warehouses, Camcorder Camera Lenses(Black): Amazon.co.uk: Electronics & Photo