I've been researching CMOS image sensors for a small working-distance, low-light application. From this, I roughly know I need a field of view of approximately 100-120 degrees. However, upon looking at various image sensors, a more common attribute listed is CRA (Chief Ray Angle). I've learned that CRA is a better way of measuring how much of an angle on which light can enter a raw image sensor without a lens. However, FOV is the attribute of choice for measuring how much light can enter a particular lens.
Some image sensor manufacturers shift the microlens on each pixel in order to correct for vignetting effects that occur on edge pixels due to CRA. This can be seen in the below picture:
If this was not done, this would occur:
This would obviously result in lost light, which in turn would produce a vignette effect on the finished image. (Shadows on the edges)
However, I'm confused as to how the FOV would be affected by the CRA value of the image sensor itself.
Overall question: How does Field of View relate to Chief Ray Angle, and how would this affect choosing a lens for a high FOV application?
Hopefully, I am asking the right questions...