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

CIL212 is a 226-degree miniature fisheye M12 lens with 1.1mm EFL and F/2.2 for 1/2.5" sensors such as the AR0521 and IMX335. At 6g and 20mm TTL, it stays compact while handling 8MP at 1.55μm pixel pitch. The 3.9mm image circle gives you a circular fisheye on most standard formats.

This lens is very wide, but it is still manageable in software. Distortion is -10% F-Θ, which is low for a 226-degree design, so correction is possible without turning the image pipeline into a science project.

That trade works well in 360-degree surveillance, aerial cameras, and robotics, where full-scene coverage matters more than geometric precision.

The M12A variant uses a hybrid glass and plastic optical design in an AL6061 barrel. The package stays light and production-friendly, but it has no ingress protection rating, so the enclosure has to handle weather and dust. Order CIL212-F2.2-M12A660 with the 660nm IRC filter or CIL212-F2.2-M12ANIR without it. Allied Vision Alvium S-mount cameras fit directly, and e-con Systems boards work with a 7-9mm holder.

Full optical, F-Θ, and TV distortion curves are available in the mechanical drawing on DocSend. Orders placed before 12 PM PST ship same day from San Diego, and Commonlands optical engineers can help with volume pricing or integration questions.