In modern video surveillance systems, a high-performance lens is critical to ensuring clear, stable imaging around the clock. The 1/2.7″ 2.7-13mm CS mount CCTV lens (model CS271312713A3) from TOWIN is a professional varifocal lens built for day–night security cameras, delivering strong adaptability, high resolution, and excellent low-light performance.

Core Technical Parameters

This lens is precision-engineered for 1/2.7″ sensors such as OV2710 and AR0237, with complete specifications as follows:

Key Product Advantages

1. Flexible Varifocal for Wide-Range Monitoring

With a 2.7–13mm varifocal design, the lens supports a horizontal field of view from 122° (wide-angle) to 23° (telephoto). It can cover large open areas at short focal lengths and zoom in to capture details at longer focal lengths, making it ideal for entrances, parking lots, corridors, warehouses, and other multi-scenario security setups.

2. Bright F1.3 Aperture for Superior Low-Light Imaging

The large F1.3 maximum aperture provides strong light-gathering capability, greatly improving brightness and detail in dim environments. Combined with auto iris, the lens automatically adjusts exposure according to ambient light, maintaining stable imaging from bright daylight to nighttime with IR fill light, effectively reducing noise and motion blur.

3. 3MP High Resolution for Sharp HD Imaging

Engineered for 3-megapixel high-definition output, the lens fully unlocks the potential of 1/2.7″ HD sensors, delivering crisp details, high contrast, and consistent clarity across the frame—essential for facial capture, license plate recognition, and other analytics-intensive applications.

4. IR-Corrected Optics for True Day–Night Use

Featuring IR-corrected optics, the lens eliminates focus shift between visible and infrared light. It stays sharply focused whether used in daylight or with IR LEDs at night, avoiding blur or ghosting common with non-corrected lenses, ensuring reliable 24/7 surveillance performance.

5. Stable CS Mount & Reliable Mechanical Design

The standard CS mount ensures wide compatibility with most surveillance cameras and straightforward installation. Manual focus and zoom allow precise on-site calibration, while the compact 58.9mm TTL structure suits camera housings of various sizes. The durable build maintains stability under long-term operation.

6. Ultra-Short Focus for Close-Up Applications

With a minimum object distance of 0.1m, the lens performs well in close-range monitoring, such as ATMs, self-service terminals, product inspection, and other short-distance shooting scenarios.

F.1.3 aperturelo-w-light imaging

Ideal Application

• Indoor/outdoor security monitoring (communities, factories, shopping malls)
• Day–night IP cameras and low-light network cameras
• Entrance control, parking lots, and perimeter protection
• Close-range detail capture (ATMs, equipment rooms)
• HD surveillance systems requiring flexible viewing angles

Conclusion

The 1/2.7″ 2.7-13mm CS mount CCTV lens (CS271312713A3) integrates varifocal flexibility, F1.3 high-sensitivity optics, 3MP clarity, and IR-corrected day–night performance. Backed by a stable CS-mount structure and professional optical design, it is a premium choice for building reliable, high-definition video surveillance systems.

For more details, parameters, and purchasing information, please visit the official product page.