FシータM12レンズ｜180°@7.5mm、5MP、2/3インチまで対応（ISX031など

CIL926 is an ultra-wide M12 lens with a 2.5mm effective focal length, F/2.4 aperture, and 172° field of view. It is designed for sensors up to 1/2.5" and uses a 7.4mm image circle. The lens is specified for 5MP with 2μm pixels and has a listed weight of 12g.

The main optical feature is its F-theta distortion profile. Commonlands lists distortion at about -1.4% F-θ, which is low for this field angle and helps keep angular mapping more uniform across the image. That matters in applications where you care about scene measurement, wide coverage, or stable geometry from center to edge.

Mechanically, CIL926 uses an all-glass, aluminum construction rather than a mixed plastic stack. That choice improves thermal stability and keeps focus behavior more predictable across temperature changes. The listed version is IP67, so it is better suited to exposed cameras than a non-sealed indoor lens.

If you need more than 170° of coverage without jumping to a circular fisheye, CIL926 is one of the cleaner options in this size class. The combination of 2.5mm EFL, 7.4mm image circle, and low F-theta distortion is aimed at wide embedded vision systems that still need usable geometry.