C-Mount Lens – C1212011818A3

C1212011818A3 is 12-120mm C-Mount 3-Megapixel lens, DC Auto Iris (F1.8~16), ultra-low distortion (<0.1%), ideal for surveillance and industrial applications.

12-120mm C-Mount Low Distortion Lens

This 12-120mm C-Mount zoom lens is designed for 1/1.8″ camera sensors, offering a versatile horizontal FOV from 33° to 3.6% and resolution up to 3MP. With a 10× manual zoom range, F1.8–16 aperture, DC auto iris, and ultra-low distortion below 0.1%, it provides flexible framing for professional CCTV surveillance and industrial imaging systems.

For system designers evaluating sensor and lens compatibility, the Sensor Guide provides useful information about image formats, while the Lens Selection Guide can help determine the appropriate optical configuration.

Product Core Highlights

• 12–120mm 10× zoom range for flexible scene coverage.
• 33°–3.6° horizontal FOV on 1/1.8″ sensors.
• F1.8–16 aperture range for changing lighting conditions.
• DC auto iris for automatic exposure control.
• Ultra-low distortion below 0.1% for accurate image reproduction.

This lens is part of Towin’s C-Mount Lenses range and is designed for applications where operators need to switch between relatively wide-area observation and detailed long-range viewing without changing the optical assembly.

C-Mount Low Distortion Lens Applications

Core Application Scenes

The major advantage of this 12-120mm industrial zoom lens is its broad focal length range. At 12mm, the lens provides a 33° horizontal FOV on a 1/1.8″ sensor for relatively broad scene monitoring. At 120mm, the FOV narrows to 3.6°, allowing the camera to concentrate on distant or relatively small targets.

This makes the lens particularly suitable for CCTV surveillance systems where the required viewing distance and target size can vary between installation sites. Security operators can manually adjust the zoom position to establish the desired framing without replacing the lens.

The DC auto iris is useful in surveillance environments where ambient illumination changes throughout the day. The F1.8 maximum aperture provides higher light transmission when illumination is limited, while the F1.8–16 range gives system integrators greater exposure control.

With distortion below 0.1%, the lens is also appropriate for surveillance scenes containing architectural structures, road layouts, industrial facilities, and other applications where maintaining a geometrically controlled image is important.

The manual focus and manual zoom configuration provides direct optical adjustment during installation. This is useful when the camera is installed at a fixed location and the operator or installer needs to establish a specific monitoring area.

For applications where the required focal length depends on target size and camera distance, the Focal Length Calculator can help estimate the focal length required for a particular field of view.

Designed for professional CCTV surveillance, long-distance observation, and variable-scene industrial monitoring applications.

Compatible Device List

• 1/1.8″ CCTV Cameras: Designed for C-Mount camera systems using 1/1.8″ sensors and requiring flexible focal length selection.
• Professional Security Cameras: Suitable for fixed-position surveillance cameras monitoring facilities, entrances, industrial areas, and controlled outdoor environments.
• Long-Distance Monitoring Systems: The 120mm telephoto end enables narrow-angle viewing of distant subjects.
• Industrial Monitoring Cameras: Can be integrated into monitoring systems where the observation distance and target size vary between installations.
• Daytime Surveillance Systems: The DC auto iris helps regulate incoming light as scene illumination changes.
• Security Control Rooms: The manual 10× zoom range provides installers with flexible framing during system setup.
• Industrial Facilities: Suitable for monitoring production areas, equipment zones, storage yards, and other locations requiring adjustable observation coverage.

For complete information about available optical solutions, you can explore Smart Security Solutions for surveillance-oriented applications or Smart Traffic Solutions when the lens is being considered for traffic-monitoring environments.

If your camera housing, sensor, focal range, or mounting requirements differ from the standard configuration, contact Towin Lens for application-specific optical and mechanical requirements.

Frequently Asked Questions

Q: What sensor size is this 12-120mm C-Mount lens designed for?
A: The specified horizontal FOV is based on a 1/1.8″ image sensor, with a maximum image format of Φ9.3.

Q: What is the zoom range of this lens?
A: The lens provides a 12–120mm focal length range, equivalent to a 10× manual zoom range.

Q: What is the field of view of the 12-120mm lens?
A: On a 1/1.8″ sensor, the horizontal FOV ranges from approximately 33° at 12mm to 3.6° at 120mm.

Q: Is the zoom function automatic or manual?
A: The zoom is manual. The installer can mechanically adjust the focal length between 12mm and 120mm according to the required scene coverage.

Q: Does this CCTV lens have an automatic iris?
A: Yes. It uses a DC auto iris, which can automatically regulate aperture according to changes in scene illumination.

Q: What is the maximum aperture of this industrial zoom lens?
A: The aperture range is F1.8–16, providing a maximum aperture of F1.8 and allowing the lens to be stopped down to F16.

Q: Is this lens IR corrected?
A: No. According to the supplied specification, the lens is not IR corrected. It should therefore be selected according to the spectral range and illumination requirements of the intended camera system.

Q: What applications are suitable for this 12-120mm lens?
A: The combination of a 10× zoom range, DC auto iris, low distortion, and C-Mount interface makes it suitable for CCTV surveillance, industrial monitoring, security observation, and long-distance viewing systems.

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