Proceedings PaperThe 2012 zoom lens design problem: zooming monochromatic quartet
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The zoom lens design problem for the 2012 Zoom Lens IV conference is a first of its kind. The challenge is to design a lens operating at a single wavelength of 587.6 nm with a 20:1 zoom ratio using only four elements; akin to the 1990 IODC Monochromatic Quartet design problem. The lens design offers several degrees of freedom including a range of glass and aspheric elements in order to achieve the continuous zoom through effective focal lengths from 4 mm to 80 mm, with a back focal length > 16 mm. Throughout the zoom motion, the first element and the aperture stop are kept in fixed positions relative to the image plane and lens operates at a constant f/10. The goal of the problem is to minimize the length of the system as measured from the vertex of the front element to the image plane. The design is required to meet an RMSWFE < 0.07 waves to a field height of 1.25 mm, while supporting a full field height of 2.5 mm with less than 5% magnitude distortion. The winning entry met the specifications with a length of only 22.195 mm.