Computar - HG3808FCS-HSP - 3.8mm f/0.8 Ultra-Low Light CS-Mount Lens
Product Overview
The Computar HG3808FCS-HSP is an ultra-high-speed fixed focal length lens designed for high-security surveillance in extreme low-light environments. Its F0.8 aperture captures significantly more light than standard security lenses, helping compatible CCTV cameras maintain clear color imaging in near-dark conditions without relying on infrared illumination.
Key Configuration
Model: Computar HG3808FCS-HSP; lens type: fixed focal length; aperture: F0.8; iris type: galvanometer-driven DC auto iris; optics: aspherical glass; primary use: low-light surveillance, perimeter monitoring, city surveillance, and LPR preparation.
Key Features
• F0.8 aperture maximizes light intake for extreme low-light imaging.
• Fixed focal length design supports stable surveillance framing.
• Aspherical glass optics help reduce edge distortion and improve image clarity.
• Galvanometer-driven DC auto iris automatically adapts to major lighting changes.
• Suitable for perimeter security, 24/7 city monitoring, and low-light vehicle capture.
Technical Context
The wide F0.8 aperture helps deliver more light to the camera sensor, which can support faster shutter speeds and clearer imaging in dark scenes. This is useful for applications such as fence lines, ports, yards, streets, and vehicle monitoring areas where added lighting may be impractical or undesirable.
Installation Notes
Use with compatible CCTV cameras that support DC auto iris lens control. After installation, verify exposure behavior across daylight, dusk, and nighttime conditions to ensure the iris response and focus are optimized for the monitored scene.
| Optical Specifications | |
| Focal Length | 3.8 mm (Provides a wide-angle field of view). |
| Aperture Range | F0.8 – F360 (Extremely fast maximum opening to near-total closure). |
| Lens Type | Aspherical (Reduces spherical aberration and improves contrast). |
| Angle of View (on 1/2" sensor) | 87.0° Horizontal / 67.2° Vertical. |
| Focus Range | 0.2 meters (minimum object distance) to infinity. |
| Physical & Mechanical Properties | |
| Mount Type | CS-mount (Standard for traditional box security cameras). |
| Sensor Compatibility | Optimally designed for 1/2-inch sensors (Also backward compatible with 1/3" and 1/4" sensors). |
| Dimensions | Approximately 47 mm (Diameter) x 50.5 mm (Length). |
| Weight | 85 grams (Lightweight, compact profile). |
| Operation Temperature | Optimized for reliable outdoor/indoor enclosure use from -10°C to +50°C. |
| Control & Electrical Interface | |
| Iris Control | DC Auto Iris (Galvanometer type driven by the camera). |
| Focus Control | Manual adjustment with a locking screw. |
| Connection Cable | 4-pin standard mini-plug attached for direct camera connection. |
| Iris Control Voltages | Drive Coil: 190 Ω Damping Coil: 1150 Ω |