A folded dual magnification telescope, operating in the 8-12 micron waveband, has been designed to be incorporated
in a pressure resistant housing sealed with a spherical profile pressure window. A single element is located
immediately behind the window and is aspherised to control the aberrations generated by the window. An additional
aspheric element is incorporated in a two lens turret which is switched in to provide low magnification.
The trade-offs between control of aberrations, cold reflections and mechanical considerations are discussed together
with details of tolerancing and manufacturing requiitments.
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