The lens design problem for the 2017 IODC is to design a lens which includes a "100 lens" to commemorate the OSA's 100th anniversary. Traditional lens specifications (focal length, f/number, field of view, etc.) are not specified; the goal of the problem is to maximize the used diameters of the ball lenses in the 100 lens while maintaining diffractionlimited optical performance. The winning entry from Takeshi Akiyama has 54 lens elements, is 19,443 mm long and 165 mm in diameter, yet has a focal length of only 0.02 mm; it has a merit function of 398.04 out of a maximum possible 400.
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