CS-Mount Lens – CS05511812F3

CS05511812F3 CCTV lens 1/1.8″ 5.5mm low light F1.2 IR correct CS-mount CCTV lens fixed Iris day night surveillance

5.5mm CS-Mount Wide Angle CCTV Lens

This 5.5mm CS-mount wide angle CCTV lens is designed for 1/1.8″ image sensors and delivers a 115° diagonal field of view with 83° horizontal and 60° vertical coverage. With a fast F1.2 aperture, 3MP resolution, fixed focal length, and manual focus, it provides broad scene coverage and strong light-gathering performance for professional surveillance and monitoring systems.

CS-Mount CCTV Lens Core Highlights

• 5.5mm Wide-Angle Focal Length – Provides 115° diagonal and 83° horizontal FOV for broad scene coverage.
• 1/1.8″ Sensor Compatibility – Designed to cover 1/1.8″ image sensors while supporting 3MP imaging.
• F1.2 Fast Aperture – Provides strong light-gathering capability for indoor, low-light, and changing illumination conditions.
• Fixed CS-Mount Design – A stable optical configuration for CS-mount CCTV and professional security camera systems.
• Manual Focus with Fixed Iris – Allows installation engineers to set the focus position during camera deployment while maintaining a fixed aperture configuration.

CS-Mount CCTV Lens Applications

Wide-Area Surveillance

The combination of a 5.5mm focal length and 83° horizontal FOV makes this lens suitable for surveillance scenes where a relatively broad area needs to be captured from a fixed camera position. It can cover areas such as entrances, retail interiors, corridors, reception areas, offices, small warehouses, and building access zones without requiring an ultra-short fisheye-style focal length.

Designed for wide-angle CCTV and fixed-position security monitoring applications.

Indoor Security Monitoring

The F1.2 aperture is particularly valuable in indoor environments where illumination can vary throughout the day. It provides a strong optical aperture for collecting available light, making the lens suitable for security cameras installed in commercial buildings, shops, offices, residential facilities, and other controlled environments.

For projects requiring different focal lengths or optical configurations, TOWIN’s CS-mount lens portfolio provides additional options for security and surveillance camera integration.

Entrance & Access Monitoring

The 83° horizontal FOV provides useful coverage for doors, entrances, reception areas, elevators, and access-control zones where the camera needs to capture people and activity across a relatively wide horizontal scene. The fixed 5.5mm focal length also provides predictable framing after installation.

Compact Professional Surveillance Systems

With a CS mount, manual focus, fixed iris, and 35.14mm TTL, this lens can be integrated into professional camera assemblies where installers need a conventional interchangeable CS-mount optical interface. It is suitable for CCTV cameras, indoor security cameras, commercial monitoring systems, and fixed surveillance platforms.

Compatible Devices

This lens can be considered for:

• CS-mount CCTV cameras
• 1/1.8″ security camera systems
• Indoor surveillance cameras
• Commercial security cameras
• Entrance and access monitoring cameras
• Retail and shop surveillance systems
• Office and building monitoring cameras
• Small warehouse monitoring systems
• Fixed-position professional video surveillance equipment

When selecting a lens for a specific sensor and installation distance, TOWIN’s Lens Selection Guide can help compare focal length, sensor format, FOV, and other optical requirements.

Frequently Asked Questions

Q: What type of camera is this 5.5mm CS-mount lens designed for?
A: This lens is designed for CS-mount camera systems using 1/1.8″ image sensors, with applications primarily focused on CCTV, security monitoring, and wide-area indoor surveillance.

Q: What field of view does the 5.5mm lens provide?
A: The lens provides a 115° diagonal field of view, 83° horizontal FOV, and 60° vertical FOV, providing broad coverage for fixed surveillance scenes.

Q: Is the 5.5mm lens a fixed focal length lens?
A: Yes. The focal length is fixed at 5.5mm and the zoom configuration is fixed, providing consistent framing after installation.

Q: Why is the F1.2 aperture useful for CCTV applications?
A: The F1.2 aperture provides strong light-gathering capability, which can help maintain useful image brightness in indoor areas and other scenes with limited or changing illumination.

Q: Is this lens suitable for wide-angle surveillance?
A: Yes. Its 115° diagonal and 83° horizontal FOV make it suitable for wide-area surveillance where broader scene coverage is required from a fixed camera position.

Q: Does this lens use a CS mount?
A: Yes. The lens uses a standard CS mount and is intended for compatible CS-mount camera platforms.

Q: Is this a low-distortion lens?
A: The specified distortion is below -7%, so it should not be marketed as a dedicated low-distortion lens. For applications requiring stricter geometric accuracy, a purpose-designed low-distortion lens should be selected.

Q: How can I determine whether this lens is suitable for my camera?
A: Check the camera’s sensor size, CS-mount compatibility, required field of view, working distance, and image resolution. TOWIN’s FOV Calculator can also help estimate the required lens configuration.

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