circular focus 118 the optical parameters such as the tilt angle 114 the first focal point 108 the second focal point 110 and the semi ellipse profile 106 for producing the elliptical disc mirror 102 in fig1 and 2 are given to illustrate the example embodiment described here however various alternate embodiments will be apparent to those skilled in the art upon reading the present disclosure for example the focal ring may lay in any plane located in a space between and including the first focal point and the reflecting surface it will be appreciated by a person skilled in the art that a variety of detection techniques may be used in example embodiments the collected light along the circular focus 118 may be collected in a panchromatic or monochromatic manner may be detected directly or indirectly and may be detected partially or integrally fig3 is a schematic three dimensional front view of the example embodiment in one example embodiment referring to fig4 a donut or ring shaped photodiode 402 can be used to directly and panchromatically detect the light e g 120 arriving at circular focus 118 in another example embodiment with reference to fig5 an array of optical fibers e g 502 is arranged horizontally in a.