A new way of solving and optimizing a best-fit sphere is proposed for surfacing and testing of two off-axis mirrors. A virtual fabrication program was developed for determination of CCOS CNC process parameters. The two off-axis aspheric mirrors surfaced are a convex mirror with an aperture of 165 mm×100 mm and a lightweighted concave mirror with an aperture of 770 mm×200 mm
and the design accuracies required for these two off-axis mirrors are better than 0.025 λ RMS with λ=632.8 nm over any 100 nm or 200 nm diameter sub-aperture. Inspections showed that the finish accuracies of convex and concave mirrors satisfied the design requirements
and they reached 0.023 λ RMS and 0.013 λ RMS respectively.
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