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Mechanical aspects of a dual field of view infrared lens

A dual field of view IR lens system that incorporates motorized mechanical movement in a compact package is presented. A feature of the design is to change the field of the lens system in less than one second. A secondary goal of the system is to maintain a low overall system profile. Attention is given to the task of identifying a candidate motor for the system. Some commonly encountered pitfalls in the design process are identified.