CCTV Lens – CS257513018M3

CS257513018M3 is High-resolution 3 Megapixel CCTV lens, 1/3″ 2.5-7.5mm manual zoom lens, F1.8 CS mount lens with Low F-number (Fast Lenses).

2.5–7.5mm CS-mount CCTV lens

This 2.5–7.5mm CS-mount zoom lens is a 3MP wide-angle CCTV lens designed for 1/3″ image sensors. With a 118° to 40° horizontal field of view, manual zoom, manual focus, and manual iris control, it provides flexible framing for security cameras and compact surveillance systems where both wide-area coverage and adjustable viewing distance are required.

Product Core Highlights

• 2.5–7.5mm manual zoom range for flexible scene framing.
• 118°–40° horizontal FOV supports both wide-area and narrower surveillance views.
• F1.8 aperture provides efficient light transmission for indoor and general surveillance.
• 3MP resolution matches mainstream 1/3″ security camera sensors.
• CS mount with manual iris and focus allows practical camera integration and field adjustment.

CS-Mount CCTV Lens Applications

Core Application Scenes

This CS-mount wide-angle zoom lens is designed for surveillance systems that need more flexibility than a fixed focal length CCTV lens can provide. At the 2.5mm setting, its 118° horizontal field of view is suitable for monitoring entrances, corridors, retail areas, small offices, and other scenes where a broad viewing area is important. The focal length can then be adjusted toward 7.5mm when a more concentrated view is required.

The manual zoom configuration also makes this lens suitable for security camera installations where the installer needs to adjust coverage according to the actual mounting position. Its 0.3m minimum object distance allows relatively close subjects to be captured, making it useful for indoor monitoring points such as reception areas, access-control zones, counters, and equipment rooms.

For projects requiring different framing distances from the same lens platform, this product can be combined with Towin’s broader CS-Mount Lenses range to compare fixed focal and other security lens configurations.

Compatible Device List

• 1/3″ Security Cameras: Designed for compact CCTV cameras using 1/3″ image sensors and CS-mount interfaces.
• Indoor Surveillance Cameras: Suitable for offices, retail stores, entrances, corridors, reception areas, and equipment rooms.
• Wide-Area Monitoring Systems: The 2.5mm setting provides a broad 118° horizontal FOV for applications requiring extensive scene coverage.
• Adjustable Surveillance Installations: Manual zoom, focus, and iris controls allow installers to optimize image framing after camera installation.
• Compact Security Equipment: The CS mount makes the lens suitable for camera platforms designed around conventional CS-mount optical interfaces.

For applications involving broader surveillance coverage and intelligent monitoring, this lens can also be evaluated alongside Towin’s Smart Security solutions.

When selecting the appropriate focal length and viewing range, users can refer to the Lens Selection Guide and use the FOV Calculator to estimate the relationship between focal length, sensor size, and field of view.

Designed for flexible indoor CCTV surveillance, wide-area security monitoring, and adjustable camera viewing applications.

Frequently Asked Questions

Q: What type of camera is this lens designed for?
A: This lens is designed primarily for 1/3″ security and CCTV cameras with a CS-mount interface.

Q: Is this a fixed focal length lens?
A: No. This manual zoom lens delivers a 2.5–7.5mm focal length range. Users adjust the viewing angle to match the installation scene.

Q: What is the horizontal field of view of this lens?
A: The horizontal field of view ranges from approximately 118° at 2.5mm to 40° at 7.5mm.

Q: Is the iris automatic or manual?
A: The iris is manual, allowing the installer to adjust the aperture according to the lighting conditions.

Q: What is the minimum object distance?
A: The specified M.O.D. is 0.3m, allowing the lens to focus on relatively close subjects.

Q: Can this lens be used for indoor CCTV surveillance?
A: Yes. Its wide-angle range, F1.8 aperture, manual zoom, and CS mount make it suitable for many indoor CCTV and security monitoring applications.

Q: Can I use this lens for machine vision?
A: It may be suitable for certain general-purpose imaging or monitoring systems, but its primary positioning is CCTV and security imaging. For precision machine vision, we also evaluate optical factors including distortion, MTF, sensor coverage, and working distance.

Q: How can I select the correct focal length for my camera system?
A: The required focal length depends on sensor size, working distance, and target field of view. Towin’s Focal Length Calculator can help estimate the required focal length for a specific imaging setup.

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