Hello Zemaxers, 

I am trying some illumination optimizations for a system that maps the homogeneous film to the image plane (kindly see the schematics below). Normally, for imaging system optimization I could use default merit function like spot size. But in this illumination case that the I could think of using REAY the y-coordinates for the 0, 0.7 and 1 fields. Maybe the REAB for the REAB for the ray angle as well. 

Can you please suggest if there are any other operands that might be useful to set up the constraints of the merit function for this illumination application? Thank you!