Fast Double-Gauss Lens
The double-Gauss form is one of the most common lens design types, and it appears in more than 400 U.S. patents alone. One of the most desirable aspects of the double-Gauss is its ability to be well corrected at a very high aperture over a moderately large field of view. It is possible to design reasonably high performance double-Gauss lenses having a numerical aperture greater than 0.5 (f/# less than 1.0), but such ultra-high aperture designs are still fairly exotic and appear in fewer than 20 U.S. patents.
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