3mm Wide Angle M12 Lens for up to 1/2.6" such as IMX415

CIL327 is an ultra-wide M12 lens with a 2.7mm effective focal length and available F/1.5 and F/1.8 versions. It gives 169° field of view, is specified for a 1/2.6" sensor format, uses a 7.1mm image circle, and is listed at 3MP with 3μm pixels for the F/1.5 version. The total weight is 7g.

This lens is about wide coverage with more light throughput than a typical compact board lens. The F/1.5 option helps maintain exposure and frame rate in low-light scenes where a slower ultra-wide would force longer integration or more gain. The lens is specified at -13% F-Theta distortion at a 7.1mm image circle, so the mapping stays predictable instead of pretending to be rectilinear at an angle where that would be unrealistic anyway.

The construction is all glass in an aluminum housing, and that is the right call when thermal stability matters. The listed mechanical version is IP67, so the lens is easier to trust in outdoor or vehicle-mounted cameras than an open-barrel design would be.

If your system needs very wide coverage and strong low-light capability, the CIL327 is the more aggressive choice than a slower 2.7mm lens. The 169° FoV and F/1.5 version point it at embedded vision designs that need scene coverage first and still need usable night or indoor performance.