Fisheye Lens – S02113013618F

S02113013618F is 165° 2.1mm M12 Fisheye Lens with Built-In Filter, 5-Megapixel CCTV HD lens 1/3″ M12 mount F1.8 security surveillance lens.

5MP 2.1mm M12 Ultra-Wide Fisheye Lens

This 5MP M12 ultra-wide angle fisheye lens is designed for compact camera modules that require high-resolution imaging and exceptionally broad scene coverage. With a 2.1mm fixed focal length, the lens delivers a 165° diagonal FOV, 136° horizontal FOV, and 105° vertical FOV on a 1/3″ image format.

The F1.8 aperture, 3.5mm BFL, 0.2m minimum object distance, and M12×0.5 mount make this lens suitable for compact wide-area monitoring, embedded vision, smart security, and other imaging systems where a large field of view and short optical path are important.

Explore TOWIN’s M12 lens range for additional compact optical solutions.

M12 Fisheye Lens Core Highlights

• 5MP high-resolution imaging: Provides more image detail than typical 2MP/3MP ultra-wide solutions while maintaining a very broad field of view.
• 165° diagonal ultra-wide FOV: The 2.1mm focal length captures an exceptionally large scene, helping reduce blind spots in fixed-camera installations.
• F1.8 aperture: The wide aperture supports brighter image capture for compact wide-angle imaging systems.
• 3.5mm short BFL: The short back focal length is beneficial for compact camera architectures with limited space between the lens and image sensor.
• M12×0.5 compact mounting: Provides a practical optical interface for embedded camera modules and other space-constrained devices.

For engineers evaluating sensor compatibility and field of view, TOWIN provides a sensor guide and FOV calculation guide.

M12 Fisheye Lens Applications

Core Application Scenes

This 2.1mm M12 fisheye lens is designed for applications where maximum scene coverage is a primary optical requirement. Its 165° diagonal FOV, 136° horizontal FOV, and 105° vertical FOV allow a single compact camera to capture a very large surrounding area.

Designed for ultra-wide monitoring applications. The combination of 5MP resolution and an extremely wide field of view makes the lens suitable for systems that need broad environmental visibility without using a larger optical assembly.

Recommended applications include:

• Wide-area indoor surveillance
• Smart security cameras
• Panoramic monitoring
• Compact embedded cameras
• Smart home vision devices
• IoT imaging systems
• Robotics environment perception
• Indoor navigation and spatial awareness
• Wide-angle monitoring
• Compact environmental sensing cameras

The 136° horizontal FOV is particularly useful for applications where broad lateral coverage is required. A single camera can monitor a wider area from a fixed installation position, potentially reducing the number of cameras needed for certain monitoring layouts.

For security applications, this lens can be considered alongside TOWIN’s smart security solutions.

The 0.2m M.O.D. also makes the lens suitable for relatively close-range wide-area observation, where objects may appear near the camera while the system still needs to capture a large surrounding scene.

Compatible Devices

This M12 ultra-wide lens can be integrated into:

• 1/3″ camera modules
• 5MP embedded cameras
• M12-mount IP cameras
• Compact surveillance cameras
• Smart security devices
• IoT vision cameras
• Panoramic imaging modules
• Robotics vision cameras
• Indoor monitoring systems

For applications requiring different focal lengths, sensor formats, or FOV configurations, TOWIN offers a broader M12 lens product range.

Optical Performance Considerations

With a 165° diagonal field of view and specified horizontal distortion below -49%, this lens is optimized for very wide scene coverage rather than low-distortion precision imaging.

The high level of optical distortion is an expected consideration for an ultra-wide/fisheye optical design. It can be advantageous for surveillance, environmental perception, panoramic viewing, and other applications where capturing more of the scene is more important than preserving straight-line geometry.

For dimensional measurement, precision inspection, or applications requiring highly accurate geometric representation, a low-distortion optical design may be more appropriate. Engineers can refer to TOWIN’s lens distortion guide when comparing optical options.

The 3.5mm BFL is also an important mechanical advantage for compact camera designs, particularly when the available space behind the lens is limited.

Frequently Asked Questions

Q: What type of lens is this 2.1mm M12 lens?
A: It is a fixed focal length M12 ultra-wide angle lens with a 165° diagonal field of view, making it suitable for fisheye and wide-area imaging applications.

Q: What sensor size is this 5MP M12 lens designed for?
A: The lens is designed for a 1/3″ image format and supports 5MP imaging for compatible camera modules.

Q: What is the field of view of this M12 fisheye lens?
A: The lens provides a 165° diagonal FOV, 136° horizontal FOV, and 105° vertical FOV at a 2.1mm focal length.

Q: What is the advantage of the F1.8 aperture?
A: The F1.8 aperture provides a relatively wide optical aperture, which can help support brighter image capture in wide-angle camera applications where available illumination is limited.

Q: Is this a low-distortion M12 lens?
A: No. The specified horizontal distortion is below -49%, so this lens is designed primarily for ultra-wide scene coverage rather than precision low-distortion imaging.

Q: Is this lens suitable for machine vision?
A: It can be considered for embedded machine vision and environmental perception applications where an extremely wide field of view is required. However, applications involving precision measurement should evaluate the distortion characteristics carefully.

Q: What is the back focal length of this lens?
A: The specified B.F.L. is 3.5mm. This short optical distance can be useful when integrating the lens into compact camera modules with limited internal space.

Q: Is the IRCF specification the same as IR correction?
A: No. IRCF refers to an IR cut filter. It should not be interpreted as an IR corrected optical design. This lens should therefore be classified as an IR-cut configuration rather than an IR corrected lens.

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