CCTV Lens – CS271212714A3

CS271212714A3 is 2.7-12mm IR corrected CCTV lens, 1/2.7″ manual zoom and focus lens, F1.4 CS mount, 3-Megapixel, DC auto iris Low Light Sensitive Lens.

2.7–12mm CS-Mount IR Corrected CCTV Lens

This 2.7–12mm CS-mount CCTV lens is designed for 1/2.7″ cameras, providing a 120° to 29° horizontal field of view with 3MP resolution. Its F1.4-C aperture, DC auto iris, manual focus and manual zoom provide flexible image control for changing surveillance scenes.

CS-Mount CCTV Lens Core Highlights at a Glance

• 2.7–12mm varifocal range for wide-area and tighter scene coverage from one lens.
• 120°–29° horizontal FOV supports both broad surveillance and narrower viewing requirements.
• F1.4–C aperture with DC auto iris helps maintain image exposure under changing lighting conditions.
• IR corrected optical design supports more consistent focus when infrared illumination is used.
• 0.1m minimum object distance provides flexibility for relatively close-range surveillance scenes.

CS-Mount CCTV Lens Applications

Core Application Scenes

The main advantage of this lens is its combination of a very wide 2.7mm setting and a 12mm telephoto end. At 2.7mm, the lens provides a 120° horizontal field of view, making it suitable for monitoring entrances, corridors, rooms and other relatively wide scenes. Moving toward 12mm narrows the field of view to approximately 29°, allowing the installer to adjust framing for subjects positioned farther away.

The F1.4–C aperture range and DC auto iris make the lens suitable for surveillance environments where illumination changes during operation. The IR corrected optical design is particularly useful for day/night CCTV systems using infrared illumination, helping reduce focus changes associated with switching between visible and infrared light.

With a 0.1m M.O.D., the lens can also accommodate relatively close installation scenarios where the monitored subject is positioned near the camera.

Designed for security surveillance and day/night CCTV applications where flexible framing, wide coverage and IR compatibility are required.

Compatible Device List

• 1/2.7″ CCTV cameras
• CS-mount security cameras
• IP surveillance camera modules with compatible CS interfaces
• Indoor surveillance cameras
• Day/night CCTV systems
• Entrance and access monitoring cameras
• Retail and commercial security cameras
• General-purpose monitoring systems

For applications requiring a different sensor format or mount, TOWIN’s CS-Mount Lenses provide additional lens configurations for CCTV and security imaging.

Choosing the Right Focal Length

The focal length setting can be selected according to the required coverage:

Because the lens covers a large focal-length range, installers can adjust the framing after mounting instead of replacing the lens with another fixed focal length model.

For projects where field of view needs to be calculated before selecting a lens, TOWIN’s FOV Calculator can be used to estimate the required viewing coverage.

The TOWIN Lens Selection Guide can also help evaluate sensor format, focal length, field of view and mounting requirements together.

Optical Characteristics and Practical Considerations

The specified distortion range of -80% to -2% indicates that this lens is designed around a very wide-angle viewing requirement rather than low-distortion machine vision imaging. The 2.7mm setting delivers an exceptionally broad field of view, so geometric distortion should be considered when the application requires accurate measurement or precise dimensional inspection.

For conventional security monitoring, where scene coverage is generally more important than geometric measurement accuracy, the wide-angle characteristic can be useful.

For precision imaging applications that require controlled distortion, TOWIN’s Distortion Guide provides additional information on how lens distortion affects image geometry.

Frequently Asked Questions

Q: What cameras are compatible with this 2.7–12mm lens?
A: This lens is designed for cameras using a 1/2.7″ image format and a CS mount. The camera should also support the lens’s mechanical and optical requirements.

Q: Is this lens a fixed focal length lens?
A: No. It is a manual varifocal zoom lens with a focal-length range of 2.7–12mm, allowing the viewing angle to be adjusted after installation.

Q: What is the horizontal field of view of this lens?
A: The specified horizontal field of view ranges from approximately 120° at the wide end to 29° at the 12mm end.

Q: What does IR corrected mean for this lens?
A: IR correction is intended to improve focus consistency when the imaging system operates across visible and infrared wavelengths, making the lens suitable for day/night surveillance systems.

Q: Does this lens support automatic exposure adjustment?
A: The lens uses a DC auto iris, allowing the aperture to respond to changes in illumination when paired with a compatible camera and control system.

Q: What is the minimum object distance?
A: The specified M.O.D. is 0.1m, allowing the lens to focus on relatively close subjects when correctly installed and adjusted.

Q: Is this lens suitable for machine vision inspection?
A: It can be considered for general imaging or monitoring tasks, but the specified -80% to -2% distortion indicates that it is not primarily designed for precision geometric measurement. Applications requiring low distortion and tightly controlled optical performance should use a lens specifically designed for machine vision.

Q: Can I calculate the required focal length before choosing this lens?
A: Yes. TOWIN’s Focal Length Calculator can help estimate focal length requirements based on the camera, working distance and target field of view.

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