Hello,

I am building an optical system with a number of surfaces. One of the surfaces I am using is an off axis surface.  I put the surface off axis using coordinates breaks.  The vertex of the surface is off of the optical axis of the system.  The chief ray intersects this surface not at its vertex.  I would like to optimize the surface ROC using a merit function BUT I want to constrain the chief ray path length (from the priovious surface to the off axis surface) to a fixed value.  How do i constrain this chief ray distance yet allow the ROC to vary based on the merit function?

thanks

John