How Are Lens Formats Related To Sensor Size? (1/4", 1/3", 1/2", Etc.)

Some more self educating.

How do you relate cctv lens formats to imaging sensor formats?

CCTV lens catalogs (like Pentax for example) describe lens formats of 1/4, 1/3, 1/2 or 2/3 even.

Looking at Sony IMX sensors, I don't see those exact ratios. IMX226 is a 1/1.7 12.4M pixel sensor. Others are 1/1.8 or 1/2.7 or 1/2.8

Does a 1/2 format lens work without vignetting on the 1/1.7 format sensor? Does a 1/3 lens mate well with a 1/2.8 sensor?

I also notice that many CCTV lens catalogs don't mention how many pixels the lens will resolve to. The IMX226 is a 12M sensor that can be had with SoC for under $300. Seems the lenses have catching up to do. Cameras have 3 main components: Sensor, SoC (where the firmware lives) & the lens.

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