Product overview A compact 1/2.5 inch 4mm fixed iris lens engineered for 3MP CCTV systems. Designed for use with CCD and IP cameras that accept CS mount optics, this lens provides reliable infrared compatible imaging for standard surveillance and monitoring applications. Key benefits resolution support: Optimized for 3 megapixel sensors to deliver clear, detailed images that improve identification and scene analysis. Infrared compatible: Built for IR use so the lens performs well with camera infrared illumination for night and low light monitoring. Simple installation: Standard CS mount fits most CCTV camera bodies, enabling quick replacement or upgrade without adapter parts. Stable optical performance: Fixed iris design maintains consistent exposure and focus for controlled lighting environments, reducing the need for frequent adjustment. Compact form factor: Small size makes it easy to install in compact camera housings and tight mounting locations. Main features Sensor format: 1/2.5 inch, matched to common security camera sensors Focal length: 4mm for wide to moderate field of view on 1/2.5 inch sensors Resolution: Supports up to 3MP imaging Iris type: Fixed iris for predictable performance under steady lighting Infrared: IR compatible for use with near infrared illumination Mount type: CS mount for direct compatibility with CS mount camera bodies Intended use: For CCD and IP cameras in surveillance setups Practical applications Retail and store surveillance: Install above entrances or aisles to capture clear 3MP footage for loss prevention and customer flow analysis. Perimeter and night monitoring: Combine with IR illumination for consistent night time coverage of fences, loading docks, and parking areas. Industrial and process monitoring: Mount on fixed production line cameras where stable focus and consistent exposure are required. Compatibility and installation notes Compatible with cameras that use a CS mount and 1/2.5 inch sensor format, including many CCD and IP models. Fixed iris means no auto adjustment for rapidly changing light; ideal for controlled lighting or when paired with appropriate IR illumination. This lens provides a straightforward optical upgrade for surveillance systems needing stable, infrared capable 3MP imaging with easy CS mount installation.