CCTV Lens – CS361111815A3

 1/1.8″ CCTV Vari focal Lens 

• Big image format,well match1/1.8″ , 1/2″, 1/2.5″ sensor.
• Vari-focal Length 3.6-11mm
• IR correct Lens, good for Day&Night Surveillance
• Low light sensitive, Aperture F1.5
• DC Auto Iris.
• 3Megapxiel and CS mount , suiatble for brand camera like Hikvision, Dahua body camera
• Besides, there are 1/1.8″ 12-50mm, 7-25mm, 10-50mm, 3.7-18mm 5 MP~8MP CS mount lens available

3.6-11mm CS-Mount 3MP Varifocal CCTV Lens

This 3.6-11mm CS-Mount CCTV lens is designed for professional surveillance systems requiring wide-area coverage, adjustable focal length, and reliable imaging under changing lighting conditions. With 3MP resolution, a fast F1.5 aperture, DC auto iris, manual focus and zoom, and IR correction, it provides a flexible optical solution for security camera applications.

Supporting a 1/1.8″ image format, the lens delivers a horizontal field of view from 113° to 46°. The 3.6mm setting provides broad scene coverage, while the 11mm position offers a narrower viewing angle for more concentrated monitoring. This lens works well for entrances, indoor spaces, parking areas, commercial facilities, and perimeter surveillance that need flexible framing.

Product Core Highlights

• 3.6-11mm adjustable focal length — Provides flexible framing from broad-area surveillance to more concentrated observation.
• 113°~46° horizontal FOV — Delivers wide scene coverage at the short focal-length position while maintaining a narrower view at 11mm.
• F1.5 fast aperture — Provides strong light-gathering capability for surveillance environments with limited or changing illumination.
• DC auto iris — Automatically adjusts the aperture according to lighting conditions to support stable camera exposure.
• IR corrected optical design — Supports day-and-night surveillance systems operating with visible and infrared illumination.

CS-Mount Varifocal CCTV Lens Applications

The 3.6-11mm focal range gives this CS-Mount CCTV lens a practical balance between wide-area coverage and adjustable monitoring. At 3.6mm, the 113° horizontal field of view is suitable for covering entrances, retail interiors, corridors, parking areas, reception zones, and other scenes where a broad perspective is important. At 11mm, the 46° horizontal FOV provides a more concentrated view for monitoring specific areas within a larger scene.

The F1.5 aperture is well suited to surveillance environments where lighting can vary throughout the day. Combined with DC auto iris, the lens can automatically regulate the aperture according to available illumination. IR correction makes the lens suitable for surveillance cameras that transition between visible-light and infrared-assisted nighttime operation.

The 0.3m minimum object distance also gives installers greater flexibility when the camera must observe relatively close subjects. Manual focus and manual zoom allow the optical framing to be adjusted during installation according to the actual surveillance scene.

Designed for wide-area CCTV surveillance application, this lens is particularly suitable for installations where a single camera needs adjustable coverage rather than a fixed viewing angle.

Compatible Devices and Systems

• Professional CS-Mount CCTV Cameras — Designed for compatible CS-mount security cameras using a 1/1.8″ image format.
• Wide-Area Indoor Surveillance Cameras — Suitable for retail stores, office areas, corridors, reception zones, and other indoor scenes requiring broad coverage.
• Entrance & Access Monitoring Systems — The wide 113° horizontal FOV helps cover doors, entrances, and access points, while the longer focal length provides tighter framing when needed.
• Parking & Perimeter Surveillance — The adjustable focal range allows installers to balance broad scene coverage with more concentrated observation.
• Day & Night Security Cameras — F1.5 aperture and IR correction make the lens suitable for surveillance systems operating under changing illumination.
• Commercial Security Systems — Suitable for applications where adjustable framing and broad coverage are required from a CS-Mount CCTV lens.

For additional CS-mount surveillance options, explore TOWIN’s CS-Mount Lenses and Vari-Focal CCTV Lens categories.

When selecting a CCTV lens, focal length and sensor size should be considered together because they directly affect the resulting field of view. TOWIN’s Lens Selection Guide provides additional guidance, while the FOV Calculator can be used to evaluate different focal-length and sensor combinations.

Frequently Asked Questions

Q: What type of lens is the 3.6-11mm CS-Mount lens?
A: It is a 3MP CS-Mount varifocal CCTV lens with a 3.6-11mm focal range, F1.5 aperture, DC auto iris, manual focus and zoom, and IR correction.

Q: What is the field of view of this 3.6-11mm CCTV lens?
A: The horizontal field of view ranges from 113° to 46°. The 3.6mm setting provides the widest view, while the 11mm setting provides a narrower view for more concentrated surveillance.

Q: Is this lens suitable for wide-angle CCTV applications?
A: Yes. Its 113° horizontal FOV at 3.6mm makes it suitable for wide-area surveillance scenes such as entrances, indoor spaces, retail areas, and parking zones.

Q: What is the advantage of the F1.5 aperture?
A: The F1.5 maximum aperture provides strong light-gathering capability, making the lens suitable for surveillance environments where illumination may be limited or variable.

Q: What does IR correction do in this CCTV lens?
A: IR correction is intended to support consistent focusing when the camera operates under visible light and infrared illumination, which is useful for day-and-night surveillance systems.

Q: Can the focal length be adjusted manually?
A: Yes. The lens features manual zoom, allowing the focal length to be adjusted from 3.6mm to 11mm during installation to achieve the desired surveillance framing.

Q: What is the minimum object distance of this lens?
A: The minimum object distance is 0.3m, providing flexibility for applications where the camera needs to monitor subjects relatively close to the lens.

Q: What cameras are compatible with this lens?
A: The lens is designed for compatible CS-Mount CCTV cameras using a 1/1.8″ image format. Mechanical and optical compatibility should be confirmed with the camera manufacturer before installation.

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