The lens design problem for the 2006 IODC is to take a cylinder of N-BK7 glass 100 mm long and divide it into two
separate lenses, which when shuffled back together like a deck of cards will reform the original glass cylinder. The two
lenses must have the same focal length, entrance pupil diameter, and field of view, and must both be near diffractionlimited
in performance. There is no restriction on the number of elements in each lens, as long as they can reform the
glass cylinder. The merit function is the product of the entrance pupil diameter and the semi-field of view. There were 32
entries; the number of elements in each sub-lens varied from 5 to 37. The merit functions varied from less than 100 to
over 400. The winning entry had an EPD of 17.8 mm and a field of view of 22.78° for a merit function of 405.53.
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