This category focuses on Ritchey–Chrétien (RC) telescope case studies that highlight how Avantier balances optical precision, structural design, and manufacturability to meet the stringent demands of space imaging missions. A featured project shows how replacing traditional materials with carbon fiber reinforced polymer (CFRP) dramatically improved thermal stability and reduced weight, enabling a flight-ready imaging system optimized for harsh orbital environments. The case studies walk through the full process: defining performance goals, analyzing thermal and mechanical behavior, refining mirror and structure interfaces, and validating stability through testing. They also show how careful coordination between optical design and mechanical engineering ensures that image quality is preserved across temperature swings and launch loads. For engineers and program leads planning new RC telescopes or upgrading legacy platforms, these examples provide practical insights into material choices, alignment strategies, and design-for-manufacturing approaches. The category demonstrates how Avantier collaborates with customers to achieve reliable, lightweight telescopes that maintain high resolution and stable focus for demanding Earth observation and deep-space applications.