HD 3MP CS Lens 2.5mm

This 2.5mm focal length CS-mount lens is calibrated to extract full 3MP resolution from 1/2.5" and 1/2.7" format image sensors—common in mid-tier UK security cameras. Its all-metal housing resists vibration-induced misalignment, and the precision-ground optics maintain Modulation Transfer Function (MTF) >60% at Nyquist frequency, ensuring pixel-level detail retention. Designed for fixed-installation use, it supports optional fixed-focus configuration to eliminate focus creep in high-traffic or mechanically stressed mounting locations. Focal length was selected for optimal trade-off between spatial coverage and subject scale: at 4m distance, a 2.5mm lens captures approx. 4.2m horizontal width on 1/2.7" sensors—sufficient for full-body framing of individuals entering a shopfront, while retaining facial features legible for post-event analysis. Aperture variants allow matching to site-specific lighting—F1.2 for dusk/dawn visibility, F2.0 for balanced day/night performance, F2.5 for extended depth across shelving or machinery rows. Commonly specified by UK system integrators for insurance-approved CCTV packages, it meets EN 62676-4 image quality benchmarks for identification-grade surveillance in commercial premises under BS 8418 guidelines.