Abstract: A 3 - 5 $mu@m zoom lens system is designed with four moving components. Even though the optical system is designed to provide high resolution throughout the 4:1 zoom range, it is still compact. A special optimization method is used for finding the cam solution of the zoom lens. The polynomial equations from the optimization method are used for fitting zoom run during the optimization process. This method can minimize the cam sensitivity at the start of the first order design. The concept to achieve aberration balance is described. The detail design was accomplished through the use of a computer optimization program. A cam modification procedure is used to compensate the image shift after the final design. The one mrad image resolution requirement is achieved throughout the zoom range.!8
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