ITS Lens – C157511715A8

C157511715A8 is a 15-75mm C-Mount IR-corrected ITS lens.   It is long focal lenght for 8-12 megapixel 1/1.7″ sensors like IMX324, IMX226.  It has a large aperture F1.5 auto iris for low light sensitive road IP camera.

Product Overview

This 15–75mm C-Mount IR-corrected ITS lens is designed for high-resolution surveillance and long-range imaging systems that require flexible focal length control, strong light-gathering performance, and reliable day-and-night imaging. Supporting a 1/1.7″ image format and 8MP resolution, the lens provides a horizontal field of view from 26° to 6°, allowing system designers to adjust the viewing range from wider-area monitoring to narrow-angle observation of distant targets. The bright F1.5 aperture provides excellent light transmission for challenging illumination conditions, while the DC auto iris helps regulate exposure as scene brightness changes. Manual zoom and focus provide installation flexibility for different camera-to-target distances. Its IR-corrected optical design helps maintain more consistent focus across visible and near-infrared wavelengths. Designed for long-range security and smart traffic monitoring applications, this lens is suitable for CCTV, ANPR, perimeter surveillance, intelligent transportation, and industrial monitoring systems.

For additional professional optics, explore TOWIN’s C Mount Lenses.

IR-Corrected ITS Lens Advantages

15–75mm Flexible Focal Length
The 15–75mm manual zoom range provides flexible viewing control, allowing users to select a wider perspective at 15mm or a narrower, more concentrated view at 75mm for distant targets.

8MP High-Resolution Imaging
The 8MP optical configuration supports detailed image capture for modern IP cameras, surveillance systems, and intelligent vision applications where identifying small or distant objects is important.

Bright F1.5 Aperture
The F1.5 maximum aperture provides strong light-gathering capability, helping improve image brightness and support surveillance applications operating in low-light environments.

DC Auto Iris
The DC auto iris adjusts the aperture according to changes in scene illumination, helping maintain more consistent exposure across different lighting conditions.

IR-Corrected Optics
The IR-corrected optical design helps reduce focus shifts between visible and near-infrared wavelengths, supporting reliable day/night camera performance when infrared illumination is used.

Manual Zoom and Focus
Manual zoom and focus provide precise optical adjustment during installation, allowing the lens to be configured according to the required field of view and working distance.

C-Mount Interface
The C-Mount configuration supports professional surveillance cameras, industrial imaging systems, traffic monitoring cameras, and other applications requiring a robust optical interface.

IR-Corrected ITS Lens Applications

Long-Range CCTV Surveillance
The 15–75mm focal length range allows cameras to cover both relatively broad areas and distant targets. The 75mm telephoto end is particularly useful for perimeter surveillance, entrances, roads, gates, and other long-distance monitoring applications.

Explore TOWIN’s C Mount Lenses for additional high-resolution surveillance optics.

Smart Traffic & ANPR
The combination of 8MP resolution, 15–75mm focal length, F1.5 aperture, and IR correction makes this C-Mount IR-corrected ITS lens suitable for intelligent traffic cameras, vehicle monitoring, and ANPR systems where target distance and framing can vary.

Explore Smart Traffic Solutions for application-specific traffic imaging solutions.

Perimeter Security
The long focal length range can help security systems monitor fences, gates, industrial facilities, restricted areas, and distant access points while allowing installers to adjust the viewing angle during setup.

For additional security applications, see Smart Security Solutions.

Industrial Monitoring
The adjustable focal length and 8MP resolution make the C-Mount IR-corrected ITS lens suitable for monitoring production areas, equipment, access points, and other industrial environments where the camera-to-target distance may vary.

Explore Machine Vision Solutions for industrial imaging applications.

Day & Night Surveillance
The IR-corrected design supports systems that operate under both visible and infrared illumination, while the F1.5 aperture provides strong light transmission for challenging lighting environments.

Lens Selection & Technical Considerations

Focal Length and Field of View
The 15–75mm focal length range provides a horizontal FOV of approximately 26° to 6°. At 15mm, the C-Mount IR-corrected ITS lens provides a wider viewing perspective for area monitoring; at 75mm, it provides a much narrower view suitable for distant subjects and more concentrated surveillance.

For evaluating focal length and viewing requirements, use TOWIN’s FOV Calculator and review the Lens Basics.

Sensor Compatibility
This lens is designed for a 1/1.7″ image format and supports 8MP resolution. Matching the camera sensor with the lens image format is important for achieving full image coverage and avoiding vignetting.

Learn more through TOWIN’s Sensor Guide.

F1.5 Aperture and Low-Light Performance
The F1.5 maximum aperture provides strong light-gathering capability and can help maintain useful image brightness in low-light environments. This can be particularly valuable for nighttime surveillance and traffic monitoring.

Actual low-light performance will also depend on the camera sensor, exposure settings, illumination level, infrared lighting, and image processing.

IR-Corrected Performance
IR correction is important for day/night cameras because visible and near-infrared wavelengths can focus differently through conventional optical systems. This lens is designed to reduce such focus variation, helping maintain more consistent image sharpness when IR illumination is activated.

Manual Zoom and Focus
The manual zoom mechanism allows the installer to select the required focal length, while manual focus enables the lens to be accurately focused at the selected zoom position and working distance.

For additional lens selection guidance, visit TOWIN’s Lens Selection Guide.

Minimum Object Distance
The specified M.O.D. is 1.5m, making this lens more suitable for medium- and long-distance imaging than close-range applications. The final working distance should be evaluated together with target dimensions, focal length, and required image coverage.

Frequently Asked Questions

Q: What applications is this 15–75mm C-Mount lens suitable for?
A: This lens is suitable for long-range CCTV, perimeter security, smart traffic monitoring, ANPR, industrial monitoring, and day/night surveillance systems requiring flexible focal length adjustment.

Q: What is the focal length range of this lens?
A: The lens provides a manual 15–75mm focal length range. The 15mm setting provides a wider viewing angle, while the 75mm setting provides a narrower view for distant targets.

Q: What is the field of view of this lens?
A: The specified horizontal FOV ranges from approximately 26° at 15mm to 6° at 75mm. The actual field of view depends on the camera sensor configuration.

Q: Is this lens suitable for long-distance surveillance?
A: Yes. The 75mm telephoto end allows the lens to produce a narrower viewing angle for distant subjects, making it suitable for perimeter security, traffic monitoring, and other long-range surveillance applications.

Q: Is this C-Mount lens suitable for day and night cameras?
A: Yes. The IR-corrected optical design helps reduce focus variation between visible and near-infrared wavelengths, making it suitable for day/night surveillance systems using IR illumination.

Q: What does DC Auto Iris do?
A: DC Auto Iris allows the camera system to adjust the lens aperture according to changes in scene brightness, helping maintain more consistent exposure under changing lighting conditions.

Q: Can TOWIN customize this 15–75mm C-Mount lens?
A: TOWIN supports OEM and ODM optical development for surveillance, traffic, and industrial imaging projects. Requirements such as focal length range, sensor format, resolution, IR performance, aperture, mechanical dimensions, and other optical specifications can be evaluated according to the application. Contact TOWIN for engineering support.

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