CCTV Lens – CS12012516M3

CS12012516M3 is 12mm manual iris CCTV lens, 1/2.5″ F1.6 CS mount lens with Low F-number (Fast Lenses), IR corrected, 3-Megapixel resolution.

This lens is part of Towin’s CS-Mount Lenses portfolio and provides a fixed 12mm optical configuration for camera systems requiring controlled, repeatable framing.

12mm CS-Mount F1.6 Manual Iris IR Corrected CCTV Lens

This 12mm CS-mount CCTV lens is designed for focused-area surveillance where a narrower field of view and stable framing are required. Featuring an F1.6–C manual iris, manual focus, and IR-corrected optics, it provides a practical optical configuration for professional CCTV cameras and defined-area monitoring systems.

CS-Mount CCTV Lens Core Highlights

• 12mm fixed focal length provides focused coverage for defined monitoring areas.
• 28° horizontal FOV delivers a narrower perspective than wide-angle CCTV lenses.
• F1.6–C manual iris enables direct aperture adjustment during camera installation.
• 3MP resolution supports detailed surveillance imaging.
• IR-corrected optical design helps maintain consistent focus across visible and near-infrared wavelengths.

CS-Mount CCTV Lens Applications

Core Application Scenes

This 12mm CS-mount CCTV lens is intended for surveillance applications where the camera needs to concentrate on a particular zone rather than cover an entire room or large area. Its 28° horizontal and 21° vertical field of view provides a focused perspective suitable for monitoring entrances, access points, equipment zones, aisles, counters, and defined sections of larger facilities.

Compared with shorter focal-length CCTV lenses, the 12mm configuration reduces the viewing area while providing a more concentrated image of the monitored scene. This makes it useful when the camera is positioned at a relatively greater distance from a specific target and the installation does not require an ultra-wide field of view.

The F1.6–C manual iris allows installers to adjust the aperture according to the actual lighting environment. This is particularly practical for fixed camera installations where exposure conditions are known during setup and remote iris control is not required.

For selecting the correct focal length according to working distance and target coverage, engineers can refer to Towin’s Lens Selection Guide.

Compatible Device List

• 1/2.5″ CCTV cameras: Designed for camera systems using 1/2.5″ image sensors.
• Access monitoring cameras: The 12mm focal length can provide concentrated coverage of entrances, gates, reception points, and controlled-access areas.
• Equipment monitoring systems: Suitable for cameras observing specific machines, control panels, or equipment zones.
• Retail and commercial security cameras: Useful for monitoring counters, checkout areas, shelves, or other predefined sections.
• Facility surveillance cameras: The narrower viewing angle is suitable for aisles, corridors, storage zones, and other elongated monitoring areas.
• Day/night camera systems: IR correction supports camera systems that use near-infrared illumination in low-light conditions.

For broader security system integration, this lens can be evaluated with Towin’s Smart Security solutions.

Focused Monitoring for Defined Areas

The 12mm focal length makes this lens particularly appropriate when the target area has already been defined during system design. Rather than attempting to maximize coverage, the optical configuration allows the camera to concentrate on a selected zone.

Typical examples include a camera mounted across a production area and aimed toward a specific workstation, a security camera positioned to observe an entrance from a distance, or a facility camera focused along a corridor or storage aisle.

This focused viewing characteristic can help reduce unnecessary background information in the image and allocate more of the available image area to the target region.

Optical Selection Considerations

The lens provides 35° diagonal, 28° horizontal, and 21° vertical FOV on a 1/2.5″ sensor. Since it is a fixed 12mm lens, the field of view cannot be optically adjusted after installation.

Before selecting this lens, engineers should confirm the camera’s sensor format, mounting position, working distance, and required target coverage. Towin’s FOV Calculator can help estimate the relationship between focal length, sensor format, working distance, and field of view.

The lens also features IR-corrected optics, making it suitable for systems that transition between visible-light and near-infrared imaging. Additional information about matching image sensors with optical systems is available in the Sensor Guide.

Designed for focused-area CCTV surveillance, access monitoring, equipment observation, and fixed camera systems requiring a 12mm CS-mount lens with manual iris control.

Frequently Asked Questions

Q: What type of lens is this 12mm CS-mount lens?
A: It is a 3MP fixed focal CS-mount lens with a 12mm focal length, F1.6–C manual iris, manual focus, and IR-corrected optical performance.

Q: What is the field of view of this 12mm lens?
A: On a 1/2.5″ image sensor, the specified field of view is 35° diagonal, 28° horizontal, and 21° vertical.

Q: Is this lens suitable for wide-area surveillance?
A: It is better suited to focused-area surveillance than large-area wide-angle coverage. Its 28° horizontal FOV provides a more concentrated view of a defined target area.

Q: Is the 12mm lens a zoom lens?
A: No. It is a fixed focal lens. The focal length remains at 12mm after installation.

Q: What is the advantage of the F1.6–C aperture?
A: The manual F1.6–C iris allows the installer to control the aperture according to the lighting conditions, providing flexibility during camera setup.

Q: What cameras are compatible with this lens?
A: It is designed for 1/2.5″ image formats and uses a CS mount, making it suitable for compatible professional CCTV and other CS-mount camera systems.

Q: What does IR corrected mean?
A: IR correction is designed to reduce focus shifts between visible and near-infrared wavelengths, helping maintain more consistent focus when IR illumination is used.

Q: What is the B.F.L. of this lens?
A: The specified B.F.L. is 7.5mm. It should be considered when checking the optical and mechanical compatibility of the lens with the selected CS-mount camera.

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