When using the geometric encircled energy (fraction) operand, GENF, does the fractional energy calculation include rays that are vignetted by elements before the image plane in the total energy part of the calculation?
For example, suppose 100 rays are launched from the object. 5 rays are blocked by some aperture in the middle of the optical system. At the image plane, 90 rays land within the radius set by GENF. 5 rays made it to the image plane, but they landed outside of the radius set by GENF.
Is the fractional energy returned by GENF 90/100 = 90%? Or is the fractional energy 90/95 = 94.7%?
