CCTV Lens – S281212718F3

S281212718F3 is 2.8-12mm IR corrected CCTV lens, 1/2.7″ manual zoom and focus lens, 3 Megapixel resolution, F1.8 Low F-number M12/S-Mount Lens.

2.8-12mm M12 IR Corrected Zoom CCTV Lens

This 3MP 2.8-12mm M12 IR corrected zoom lens combines a 140° diagonal wide-angle field of view with a flexible 2.8–12mm manual zoom range. With M12×0.5 mounting, F1.8 aperture, manual focus and zoom, and IR-corrected optical performance, it is designed for compact CCTV cameras, embedded imaging modules, and wide-area monitoring systems.

M12 IR Corrected Zoom CCTV Lens Core Highlights

• 2.8–12mm manual zoom range provides flexible framing from very wide-area coverage to narrower viewing.
• 140° diagonal and 100° horizontal FOV deliver broad scene coverage at the 2.8mm wide end.
• IR-corrected optical design supports more consistent focusing when imaging conditions involve different wavelength ranges.
• M12×0.5 compact mounting interface enables integration into space-constrained camera modules.
• F1.8 fixed aperture with 3MP resolution provides a practical combination of optical brightness and image detail.

Applications & Compatible Devices

Core Application Scenes

Ultra-Wide Indoor Security Monitoring

At 2.8mm, this lens provides a 100° horizontal and 140° diagonal field of view, making it suitable for scenes where a single compact camera needs to cover a large area. Typical installations include entrances, hallways, small retail environments, offices, and reception areas.

Compact Embedded Surveillance

The M12×0.5 interface allows the lens to be integrated into compact camera assemblies where a larger C-Mount or CS-Mount optical system would be impractical. The 2.8–12mm range gives installers additional flexibility when the final camera position or required framing changes.

Retail and Commercial Observation

The wide-angle setting can capture a broad view of customer areas, displays, counters, or entrances. The 12mm end provides a narrower 24° vertical field of view for applications requiring more concentrated observation.

Day/Night and Near-Infrared Imaging

Unlike a standard lens with only an IR cut filter, this model is explicitly specified as IR Corrected. This makes it relevant to camera systems that need optical performance across visible and near-infrared wavelengths and helps address wavelength-related focus shifts.

Compact Industrial Observation

The flexible focal-length range can also be useful in selected industrial monitoring systems where the camera must observe different areas from a fixed installation position. Manual zoom and focus allow the optical configuration to be tuned during installation.

Designed for wide-area CCTV, compact embedded imaging, and IR-sensitive surveillance applications, this M12 zoom lens combines broad scene coverage with wavelength-corrected optical performance.

Compatible Device List

• 1/2.7″ 3MP CCTV cameras
• M12-mount security camera modules
• Compact embedded camera systems
• Wide-angle indoor surveillance cameras
• Day/night imaging systems
• Near-infrared imaging modules
• Retail and commercial security cameras
• Compact industrial observation cameras
• OEM camera assemblies

For additional compact lens options, see the M12 Lens product range.

Optical Configuration & Lens Selection

The 2.8–12mm focal range provides a relatively broad adjustment range for an M12 lens. At the 2.8mm wide end, the lens provides 100° horizontal, 72° vertical, and 140° diagonal FOV on a 1/2.7″ sensor. At 12mm, the FOV narrows to 32° horizontal, 24° vertical, and 40° diagonal.

This makes the lens particularly useful when a camera may need to cover a broad area during initial installation but also requires the ability to narrow the viewing angle for specific monitoring zones.

When selecting a lens, focal length should be evaluated together with sensor format, working distance, required image coverage, and mounting dimensions. The Lens Selection Guide provides additional guidance for selecting an appropriate optical configuration.

The required field of view at a specific working distance can also be estimated with the FOV Calculator.

IR-Corrected Optical Performance

The lens is specifically rated IR Corrected, which is an important distinction for cameras that operate under different illumination spectra.

Visible light and near-infrared wavelengths do not travel through an optical system in exactly the same way. Without appropriate optical correction, changing from visible illumination to near-infrared illumination can result in focus shifts. An IR-corrected design helps reduce this effect and maintain more consistent focusing across the intended wavelength range.

For applications where wavelength behavior is an important selection factor, the Optical Design knowledge center provides additional optical engineering information.

Frequently Asked Questions

Q1: What type of lens is the 2.8–12mm model?

A: It is a manual M12 zoom lens with wide-angle capability and IR-corrected optical performance. It is primarily suitable for compact CCTV, embedded surveillance, and wide-area imaging applications.

Q2: What is the maximum field of view of this lens?

A: At 2.8mm, the lens provides a 140° diagonal, 100° horizontal, and 72° vertical field of view on a 1/2.7″ sensor.

Q3: Is this an M12 lens?

A: Yes. The lens uses an M12×0.5 mounting interface and is designed for compatible compact camera modules.

Q4: Is this lens a fisheye lens?

A: It is not recommended to classify this model as a fisheye lens based only on the supplied specifications. Although its maximum diagonal FOV reaches 140°, the provided data does not identify a fisheye optical design. It is more accurately positioned as an ultra-wide-angle M12 zoom lens.

Q5: Is this lens IR corrected?

A: Yes. The specification explicitly states IR Corrected. This means the optical design is intended to control wavelength-related focus behavior when the camera operates across visible and near-infrared wavelengths.

Q6: Is the zoom motorized?

A: No. Both zoom and focus are manual. The focal length and focus position can be adjusted during installation or system setup.

Q7: What sensor size is this lens designed for?

A: The specified image format is 1/2.7″, and the listed field-of-view values are based on this sensor format.

Q8: What is the minimum object distance?

A: The specified M.O.D. is 0.3m. The practical imaging distance can vary depending on focal length and the final camera configuration.

For OEM applications requiring a different focal range, sensor format, field of view, mounting interface, or IR optical configuration, contact TOWIN for project evaluation.

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