Abstract: The long range observation system (LROS) is based on Ritchey-Chretien telescope that was designed, built and tested by ELOP. The telescope is mounted inside a sealed external structure with large entrance window. The concept adapted in the LROS design is to divide the mechanical structures into two major assemblies: (1) Internal optical bench that supports the sensitive optical elements. This bench is based on a structure made of composite material. (2) External body that protects and seals the internal optical structure. This structure includes large entrance window and interface flanges that can be supported on gimbal, tripod or a pedestal. The key to this design was to properly select and size these two structures in order to achieve the most rigid but light-weighted structure. This paper describes the study that was made to specify design criteria and to analyze the design according to these criteria.!0
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