The UN0391 features a 4 mm fixed-focus lens optimized for 1/2.7-inch image sensors. Equipped with day/night co-focusing technology, it delivers stable, sharp imaging around the clock—without requiring manual refocusing. It offers an 87.6° horizontal field of view (HFOV), a 6.9 mm image circle, high relative illumination (>40%), and low distortion (≥ –15%, TV method), ensuring uniform brightness and true-to-life image fidelity across the entire frame. With its compact form factor and easy integration, the UN0391 is an ideal, cost-effective optical solution for HD surveillance and smart devices—particularly well-suited for large-scale deployment projects.