191° Fisheye Lens S-Mount for 10-12MP Sensors

CIL281 is a high-resolution fisheye M12 lens with a 1.95mm effective focal length, a 191° field of view, and a fast F/1.8 aperture. It supports 10-12MP sensors with 1.55μm pixels and projects a 6.4mm image circle. That is the combination you buy when you need very wide coverage without giving up modern pixel density.

The distortion spec is the headline here. The lens is listed at -1% F-Theta distortion, which is unusually low for a fisheye near 190°. If your pipeline depends on calibration, perception, or scene stitching, that number matters more than a generic TV distortion figure because it tells you the angular mapping stays tight across the frame.

The lens covers formats from 1/2.3" up to 2/3", so you get room across several sensor families. The optics are glass, the housing is AL6061, and that package is a better answer than low-cost plastic fisheyes when the camera has to hold focus and alignment through temperature swings.

The total weight is 13g. The listed M12A construction is IP67 rated and uses BBAR on the first surface. For outdoor or exposed cameras, the mix of sealing, wide field, and F/1.8 throughput is usually the reason this part wins.