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This paper describes the design of a 3-5microns 26:1 zoom with a focal length extender capability that increases NFOV
focal length by 1.75x. Mechanical restrictions for a payload envelope will be considered as well as cold stop efficiency
issues.
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Marta C. de la Fuente, Jose M. Infante Herrero, Luis Rivera, "MWIR zoom with focal extender," Proc. SPIE 8550, Optical Systems Design 2012, 85500X (18 December 2012); https://doi.org/10.1117/12.999637