Applying Veselago lenses to solar beam-down optics

A spindle hyperboloid Veselago lens is formed by revolving the right branch of the hyperbola about the dashed line.  

What an ellipse accomplishes in mirror optics (mapping a real object to a real image) is accomplished by a hyperbola in Veselago optics. The most basic way to use a hyperbolic Veselago lens for beam-down optics is to place one focus at the outer edge of the heliostat field and the other focus at the far edge of the occulus. In this way, locations on step outside the heliostat field will (ideally) not be able to see the oculus at all.

The spindle hyperboloid Veselago lens images the outer edge of the heliostat field onto the far edge of the oculus.