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D154mm objective lens devised for 1200mm and 750mm focal lengths, perfect for detailed astronomical observations. Features advanced multilayer broadband film coating (400-700nm) for superior light transmission and exceptional image clarity. Innovative double separation devise enhances image , ensuring minimal distortion for optimal viewing experiences. Precision-engineered with a diameter tolerance of +0/-0.12mm and a center thickness tolerance of ±0.2mm for reliable performance. Combines exceptional optical characteristics with a finish of 60/40 and eccentricity of 1', making it ideal for both amateur and professional astronomers.