We present the definition, design, and construction of a 3.3X continuous-zoom short-wave infrared (SWIR) telephoto
lens. Compared to visible and mid-wave infrared lenses, defining the appropriate lens requirements of short-wave lenses
have some different trade-offs in terms of balancing radiometry and optimum focal plane sampling. In addition, the
design process of optimizing a visible zoom design form of given first-order properties to work in the SWIR band
reveals some challenges in glass selection and subsequent aberration balancing. A comparison of the actual measured
MTF performance of a prototype lens shows reasonable performance compared to the design.
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