AIDA Imaging 4K CS Mount 5mm 12 Mega-Pixel Lens The CS-Mount 5mm 12MP 4K Lens from AIDA is optimized with the AIDA Imaging 4K cameras with 1/1.7″ & 1/2.5″ image sensors. Optimized and tuned for 4K Cameras with 1/1.7″ & 1/2.5″ image sensors. CS-Mount Aperture: F2.0 Focal Length: 5mm Horizontal Field of View: 1/1.7″ = 87? 1/2.5″ = 69?