The Zenith Series represents RP’s high-performance MWIR continuous zoom lenses designed for demanding defense and industrial imaging applications. The series includes two models – Zenith 18-400mm F/3.4-4.0 and Zenith 40-800mm F/3.4-4.0 – both engineered for 1,280 × 1,024 × 10µ cooled detectors and optimized for exceptional image quality across the full 3–5µ spectral range. With up to x22 optical zoom, active athermalization, and precise boresight stability, Zenith lenses maintain sharp focus and alignment throughout rapid zoom transitions and extreme temperature variations. Compact and ruggedized (IP67 sealed), they combine superior optical performance with robust environmental endurance, ensuring reliable operation in field-deployed electro-optical systems.