2.1mm 150° Wide-Angle Lens for 1/2.5 Sensors

CIL821 is a short wide-angle M12 lens with a 2.1mm effective focal length, 150° field of view, and F/2.4 aperture. It is designed around a 1/2.5" format, with a 6.5mm image circle and support for 6-8MP sensors with 1.85μm pixels. That combination makes it a practical fit for compact 4K-class embedded cameras.

The lens uses a hybrid glass/plastic optical design in an aluminum barrel and weighs only 4.0g. That low mass helps in small camera modules where holder stiffness, vibration, and packaging volume all matter. It is a good candidate when you need a short assembly but still want wide scene coverage.

CIL821 is specified at -19% TV distortion at 6.7mm. That is not a low-distortion lens, and it should be selected with that in mind. For doorbell cameras, security modules, and other applications where maximum coverage matters more than rectilinear straight lines, the tradeoff is often acceptable.

Two mechanical options are listed: M12B without ingress protection and M12C with glued IP67 sealing. If the camera will face the elements, the sealed version is the safer choice. If packaging is fully enclosed, the non-IP version may be enough.