226° Miniature Fisheye M12 Lens for 1/2.5" S-Mount Cameras

The CIL212 is a 226° miniature fisheye M12 lens with a 1.1mm EFL and F/2.2, designed for 1/2.5" sensors like the AR0521 and IMX335. At 6g and 20mm TTL, it handles 4K+ imaging at 8MP with 1.55μm pixel pitch — pushing the boundary of what a lens this small can resolve. The 3.9mm image circle makes it a circular fisheye on most standard formats.

The -10% F-Θ distortion is on the low end for a 226° lens. It's not flat — you still get a fisheye look — but the barrel distortion is moderate enough that software correction is straightforward. For 360° surveillance, aerial cameras, and robotics where wide-angle coverage beats geometric precision, the CIL212 hits the right tradeoff.

The M12A variant uses a hybrid glass/plastic optical design in an AL6061 barrel — lighter and well-toleranced for production assembly. No ingress protection rating on this variant, so account for that in your housing design. Order CIL212-F2.2-M12A660 with the 660nm IRC filter or CIL212-F2.2-M12ANIR without. Allied Vision Alvium S-mount cameras are mechanically compatible. e-con Systems boards work with a 7–9mm holder.

Full distortion data including optical, F-Θ, and TV distortion curves are available in the mechanical drawing on DocSend. Ships same day from San Diego before 12 PM PST. Contact our US-based optical engineers for volume pricing or integration questions.