The GMM5020IA is specifically optimized for the 3-5μm spectral band, featuring a high-strength aluminum alloy housing with a precision mechanical focusing mechanism. Through rotation of the focus ring, the lens group position is adjusted to achieve precise focal length control for high-definition thermal imaging. Incorporating multi-layer anti-reflection coated optics, the system maintains exceptional imaging stability under harsh environmental conditions, making it ideal for defense, security, fire monitoring, and industrial inspection applications.