CS-Mount Lens – CCL13021MPCS

CCL13021MPCS CCTV CS-mount lens low light F1.2 1/3″ 2.1mm lens wide angle IR corrected day night fixed Iris

2.1mm CS-Mount Ultra Wide Angle IR Corrected CCTV Lens

The 2.1mm CS-mount CCTV lens is designed for 1/3″ sensors and delivers 3MP imaging with an ultra-wide 125° horizontal field of view. With an F1.6 fixed aperture, 153° diagonal FOV, and IR-corrected optical design, this lens is optimized for short-distance, wide-area surveillance where maximizing scene coverage and maintaining reliable day/night operation are key requirements.

CS-Mount Wide Angle Lens Core Highlights

• 2.1mm Ultra-Wide Focal Length – Provides exceptionally broad coverage for short-distance surveillance installations.
• 125° Horizontal FOV – Captures a large monitoring area from a fixed camera position.
• F1.6 Bright Aperture – Provides a relatively bright optical configuration for indoor and low-light surveillance environments.
• 3MP Resolution – Suitable for 3MP security cameras requiring broad scene coverage.
• IR Corrected Design – Supports day/night CCTV systems using near-infrared illumination.

CS-Mount Wide Angle Lens Applications

Core Application Scenes

The combination of a 2.1mm focal length and 125° horizontal FOV makes this lens particularly suitable for applications where a security camera must capture a very large area from a short installation distance.

Compared with longer focal length CCTV lenses, the 2.1mm configuration is better suited to close-range wide-area monitoring, where a conventional lens may leave significant portions of the scene outside the image.

Typical installation environments include small retail stores, entrances, lobbies, corridors, reception areas, compact parking spaces, elevators, warehouses, and facility rooms.

The F1.6 aperture further supports applications where lighting conditions are limited or change throughout the day. Combined with IR correction, the lens can be integrated into surveillance systems designed for continuous operation.

Designed for ultra-wide close-range surveillance applications, this lens provides a practical optical solution for fixed-position CCTV cameras using a CS-mount interface.

Ultra-Wide Close-Range Surveillance

The primary advantage of this lens is its 125° horizontal field of view. Such a broad viewing angle allows one camera to cover a large portion of a nearby scene.

This makes it particularly useful in environments where the camera cannot be installed far enough away from the monitoring area to use a longer focal length lens.

Suitable scenes include:

• Store entrances and checkout areas
• Building lobbies
• Reception areas
• Corridors and passageways
• Small warehouses
• Elevator and access areas
• Compact parking zones
• Facility rooms
• Indoor security monitoring areas

For applications requiring extremely broad scene coverage, TOWIN’s Wide Angle Lenses provide additional optical configurations.

Low-Light Wide-Area Monitoring

The F1.6 aperture is an important feature for this lens because ultra-wide surveillance cameras are often installed in indoor or partially illuminated environments.

The relatively bright aperture can help the camera receive more available light, making this configuration suitable for retail spaces, building interiors, entrances, corridors, and other areas where illumination may be limited.

The lens is therefore positioned not only around wide coverage, but also around maintaining practical imaging performance across changing lighting conditions.

Day & Night CCTV Imaging

The IR-corrected optical design makes the lens suitable for security cameras operating during both daytime and nighttime conditions.

For CCTV systems equipped with IR LEDs, the camera may switch between visible-light and near-infrared imaging depending on the available illumination. IR correction helps the optical system maintain more consistent focus when operating across these wavelengths.

This makes the lens suitable for:

• 24/7 CCTV cameras
• IR-illuminated security cameras
• Indoor day/night cameras
• Building security systems
• Retail surveillance
• Facility monitoring
• Entrance and access monitoring

Engineers looking for additional information about IR optical performance can review TOWIN’s Lens Basics.

Compatible Devices

This lens can be integrated with compatible:

• 1/3″ 3MP CCTV cameras
• 3MP IP security cameras
• Fixed wide-angle surveillance cameras
• Indoor security cameras
• Day/night CCTV cameras
• IR-illuminated cameras
• Retail monitoring cameras
• Building security cameras
• Facility monitoring systems
• Wide-area indoor surveillance platforms

For additional CS-mount solutions, explore TOWIN’s CS Mount Lenses.

Why Choose This 2.1mm CS-Mount Lens?

Frequently Asked Questions

Q: What sensor size is this 2.1mm lens designed for?
A: This lens is designed for 1/3″ image sensors and is suitable for compatible 3MP CCTV and IP camera systems.

Q: What is the horizontal field of view of this lens?
A: The lens provides a 125° horizontal FOV, 153° diagonal FOV, and 93° vertical FOV.

Q: Is this an ultra-wide-angle CCTV lens?
A: Yes. Its 125° horizontal field of view and 2.1mm focal length place it in the ultra-wide-angle category for broad-area surveillance.

Q: What applications are suitable for a 2.1mm CCTV lens?
A: It is suitable for close-range wide-area surveillance, including entrances, lobbies, retail stores, corridors, reception areas, compact parking areas, warehouses, and indoor facility monitoring.

Q: Does this lens support low-light applications?
A: The F1.6 aperture provides a relatively bright optical configuration, making the lens suitable for surveillance environments where available light may be limited.

Q: Is this lens suitable for day and night surveillance?
A: Yes. The IR-corrected design makes it suitable for CCTV systems that use near-infrared illumination for nighttime operation.

Q: Is this a fisheye lens?
A: The supplied specifications do not identify the lens as a fisheye lens. Although it provides a very wide 153° diagonal FOV, it should be categorized as an ultra-wide-angle lens unless its optical design is specifically identified as fisheye.

Q: What mount does this lens use?
A: It uses a CS mount and is designed for compatible professional CCTV and security camera platforms.

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