Free Express Shipping! iOptron Photron 200mm f/8 Ritchey-Chrétien Catadioptric Telescope (OTA Only) 200mm Ritchey-Chrétien Catadioptric OTA, 1624mm Focal Length, f/8 Focal Ratio, Low Thermal-Expansion Quartz Mirrors, Dielectric Mirror Coatings, 10...