CCTV Lens – CS08012512M3

CS08012512M3 is 8mm manual iris CCTV lens, 1/2.5″ F1.2 Low F-number CS mount lens, IR corrected, 3-Megapixel Low Light Sensitive Lens.

This lens is part of Towin’s CS-Mount Lenses range and provides a manually adjustable optical configuration for camera systems where operators or installers need direct control of aperture and focus.

8mm CS-Mount F1.2 Manual Iris IR Corrected CCTV Lens

This 8mm CS-mount CCTV lens combines a fast F1.2 aperture, manual iris control, and IR-corrected optical performance in a compact configuration for 1/2.5″ image sensors. Its 40° horizontal field of view provides controlled scene coverage for professional CCTV and other fixed-view imaging systems.

CS-Mount CCTV Lens Core Highlights

• 8mm fixed focal length delivers stable and repeatable scene framing.
• 40° horizontal FOV provides controlled coverage for defined monitoring areas.
• F1.2–C manual iris allows aperture adjustment according to lighting conditions.
• 3MP resolution supports standard high-definition surveillance imaging.
• IR-corrected optics help maintain focus consistency across visible and near-infrared wavelengths.

CS-Mount CCTV Lens Applications

Core Application Scenes

This 8mm CS-mount lens is designed for camera installations where a moderate field of view is preferred over ultra-wide coverage. With a 40° horizontal and 30° vertical FOV on a 1/2.5″ sensor, it provides a more concentrated viewing perspective suitable for monitoring specific zones rather than large open areas.

The F1.2–C manual iris gives installers direct control over the amount of light entering the camera. This is useful when cameras are deployed in environments with different illumination levels, such as indoor facilities with mixed artificial lighting or locations where lighting conditions change throughout the day.

The fixed 8mm focal length also provides consistent framing from installation to installation. Combined with manual focus, it is well suited to applications where the camera is installed at a known working distance and does not require remote optical adjustment.

For selecting the appropriate focal length and sensor combination, 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.
• Professional security cameras: The CS mount and manual optical controls suit conventional CCTV camera platforms.
• Fixed-view surveillance cameras: The 8mm focal length provides repeatable framing for defined monitoring zones.
• Indoor monitoring equipment: Suitable for offices, commercial spaces, corridors, facilities, and other controlled environments.
• Day/night camera systems: IR correction helps maintain optical focus when near-infrared illumination is introduced.
• Industrial monitoring cameras: The controlled field of view can be useful for monitoring specific equipment, workstations, or production areas where a broad-angle lens is unnecessary.

For applications requiring system-level security integration, this lens can be considered with Towin’s Smart Security solutions.

Manual Iris for Flexible Lighting Control

Unlike fixed-aperture lenses, the manual iris allows the installer to adjust the aperture according to the actual lighting environment. The F1.2–C aperture range can therefore be configured during installation to balance brightness, exposure, and depth of field according to the camera system’s requirements.

This makes the lens particularly suitable for installations where lighting is reasonably predictable but may differ significantly between deployment locations. The manual configuration also avoids the need for an electronically controlled iris when remote exposure adjustment is not required.

Optical Selection Considerations

The lens provides 50° diagonal, 40° horizontal, and 30° vertical FOV on a 1/2.5″ sensor. Because it uses a fixed 8mm focal length, the viewing angle remains constant after installation.

When selecting the lens, engineers should consider the sensor format together with the required working distance and target coverage. Towin’s FOV Calculator can be used to estimate the expected field of view for a particular camera configuration.

The IR-corrected optical design is useful for systems that may operate with both visible light and near-infrared illumination. Engineers can also refer to the Sensor Guide when checking sensor and lens compatibility.

Designed for fixed-view CCTV, controlled-area surveillance, and professional camera systems requiring manual iris adjustment and IR-corrected optical performance.

Frequently Asked Questions

Q: What type of lens is this 8mm CS-mount lens?
A: It is a 3MP fixed focal CS-mount lens with an 8mm focal length, F1.2–C manual iris, manual focus, and IR-corrected optical design.

Q: What is the field of view of this lens?
A: On a 1/2.5″ sensor, the specified field of view is 50° diagonal, 40° horizontal, and 30° vertical.

Q: Is this an 8mm zoom lens?
A: No. It is a fixed focal lens. The focal length is fixed at 8mm and cannot be optically adjusted as a zoom lens.

Q: What does F1.2–C mean?
A: It indicates a manual iris range from approximately F1.2 toward a closed aperture position. The installer can manually adjust the aperture according to the lighting and imaging requirements.

Q: What is the benefit of a manual iris?
A: A manual iris allows the installer to control the amount of light entering the sensor. It can be useful when configuring a camera for a specific lighting environment or balancing exposure and depth of field.

Q: What cameras are compatible with this lens?
A: The lens is designed for 1/2.5″ image formats and uses a CS mount. It is 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. This parameter should be considered when checking mechanical and optical compatibility with the selected CS-mount camera.

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