Zoom security camera lens application

Applications｜CS Mount Varifocal Security Lenses (2.8-12mm / 5-50mm / 5-100mm, 1/2.7”, 4MP & 5MP)

Security surveillance projects cover a wide range of scenarios, with monitoring distances varying from several meters at indoor doorways to hundreds of meters along outer perimeters. A single fixed lens can hardly deliver both panoramic overview and clear detail identification. Our series of CS mount varifocal security lenses includes three focal length options: 2.8-12mm, 5-50mm and 5-100mm. All models feature a uniform 1/2.7” optical format, compatible with 4MP and 5MP area-scan security cameras. Equipped with IR-corrected day-night parfocal design and on-site adjustable focal view, they fit diverse indoor and outdoor surveillance sites perfectly. Designed for security event capture and AI recognition, each lens allows field FoV adjustment to balance full-scene overview and close-up detail capture. They are ideal optical solutions for security projects in industrial parks, factories, logistics bases and residential communities.

Unified Specifications: CS Mount, 1/2.7” sensor format, compatible with 4MP & 5MP area sensors, IR corrected, day-night parfocal, DC auto iris optional, no focus shift when switching between day mode and infrared night mode.

1. Individual Lens Applications & Suitable Scenarios

2.8–12mm Varifocal Lens (4.3x, Short-Range Wide-Angle Model)

Recommended monitoring distance: 1–20 meters This universal short-range varifocal lens provides wide-angle coverage for large areas, while zooming in to capture fine details at close range. It can replace multiple fixed focal lenses after on-site installation and focusing, reducing stocking pressure. It is highly preferred for AI face capture sites.

Typical Applications:

• Indoor surveillance: Convenience stores, retail shops, office corridors, equipment rooms, finance offices, exhibition halls, elevator lobbies and internal warehouse aisles. Wide view for overall space monitoring; zoomed view for cashier receipts, staff and equipment panels.
  
• Entrance monitoring: Residential unit doors, office building access gates, underground garage entrances, courier station gates. Used for face capture, cross-line detection, off-post alarm and people counting.
  
• Other scenarios: Low-rise anti-throw monitoring, bicycle parking rooms and small storage rooms.
  

Installation Tips: Wall or ceiling mounting for indoor use. DC auto iris is recommended to adapt to strong ambient light and IR night illumination.

5–50mm Varifocal Lens (10x, Mid-Range All-Round Model)

Recommended monitoring distance: 5–40 meters This best-selling primary model offers wide-angle situational overview and zoom-in recognition for vehicles and human features. Balancing general patrol and evidence capture, it is the top choice for mid-range outdoor sites in parks and factories.

Typical Applications:

• Factory main roads, internal park roads, open parking lots and e-bike shelters. Wide view for traffic and pedestrian flow; zoom view for license plate and human feature recognition.
  
• Factory gates, loading/unloading platforms, logistics transfer stations and construction site monitoring, recording vehicle access and cargo handling.
  
• Residential plazas, barrier gates, mid-section perimeter fences and near-shore riverbanks. Supports intrusion detection, e-bike identification and illegal parking capture.
  

Installation Tips: Pole-mounted outdoors, matched with WDR cameras to handle backlight challenges at gateways.

5–100mm Varifocal Lens (20x, Long-Range Telephoto Model)

Recommended monitoring distance: 30–100 meters Featuring strong telephoto performance with a narrow field of view, this lens is designed for elevated fixed-point verification and remote perimeter evidence collection. It is not suitable for wide panoramic coverage. It is commonly used to zoom in and verify targets after alarms, minimizing false triggers caused by animals or swaying branches.

Typical Applications:

• Long factory perimeter walls, boundary lines, reservoir banks and riverbank fixed monitoring for fence intrusion and climbing detection.
  
• Large stockyards, mines, photovoltaic power stations and substations, mounted at high points to monitor remote equipment and unauthorized access.
  
• Remote roadside license plate capture and high-risk boundary fixed-point surveillance.
  

Installation Tips: Install on tall poles or elevated positions, avoiding tree obstructions. It is rarely deployed alone and usually works with the other two lenses for layered defense.

2. Combined Deployment Case Studies

Case 1: Medium-Sized Manufacturing Factory | 2.8–12mm + 5–50mm Combination

Project Overview: Includes office buildings, workshops, warehouses, gates, internal roads and open parking lots, without extra-long perimeter walls. Maximum monitoring distance stays within 40 meters. Deployment Plan:

• 2.8-12mm: Office lobby, workshop access gates, internal warehouse aisles, finance rooms and equipment rooms for indoor surveillance and face capture.
  
• 5-50mm: Factory gates, main roads, parking lots and loading platforms for vehicle access control, license plate recognition and pedestrian monitoring. Advantages: Cameras are interchangeable for both lens models, simplifying spare part management. No telephoto lens required, helping control project costs while meeting full-range conventional security and AI analysis demands.
  

Case 2: Gated Community with Long Perimeter Wall | 5–50mm + 5–100mm Combination

Project Overview: Complete internal roads, plazas and e-bike shelters, plus a long outer perimeter wall where remote wall sections are far from camera poles. Deployment Plan:

• 5-50mm: Main roads, central plazas, main entrances and e-bike shelters for routine internal monitoring of pedestrians, vehicles and illegal elevator access of e-bikes.
  
• 5-100mm: Installed segmentally at elevated wall points. The wide-angle setting watches the wall base normally; once perimeter alarm is triggered, zoom in to distinguish human intrusion, animal movement or tree sway and reduce false alarms. Advantages: Fixed box cameras deliver higher stability for 24/7 continuous monitoring, cutting the investment of PTZ cameras.
  

Case 3: Large Logistics & Industrial Park | Full Set: 2.8–12mm + 5–50mm + 5–100mm

Project Overview: Wide coverage including office buildings, dormitories, warehouse sorting zones, internal roads, open yards, loading platforms, long outer perimeters and river boundaries, with monitoring distances ranging from a few meters to over one hundred meters. Layered Deployment Logic:

1. Inner Zone (Indoor & Close-Range Entrances): 2.8-12mm for warehouse sorting gates, office lobbies, unit doors, equipment and finance rooms. For face capture, cross-zone alarms and document evidence recording.
   
2. Middle Zone (Open Park Areas): 5-50mm for park gates, main roads, parking lots, loading platforms and near yards as primary monitoring points. For panoramic patrol, license plate recognition and loading process recording.
   
3. Outer Zone (Remote Boundary Elevated Points): 5-100mm for far perimeter walls, river banks, remote yards, pump stations and substations. Used for pre-alarm verification and long-distance evidence capture. Advantages: Three layers of vision complement each other for close-range identification, mid-range management and long-range verification. All lenses share the same 1/2.7” format and CS mount, compatible with 4MP/5MP cameras for easy lens swapping and spare stock management. The matching scheme balances clarity and cost efficiency without improper lens waste.
   

FAQ

Q: Can these three lenses work with both 4MP and 5MP security cameras?

A: The optical design is optimized for 1/2.7” sensors. Natively compatible with 4MP and 5MP area sensors. It maintains full resolution across the entire zoom range without obvious softness at image edges.

Q: Are these lenses suitable for infrared night vision? Will focus shift occur when switching to IR mode?

A: Built with IR-corrected optics for day-night parfocal performance. Focus remains stable during day/IR switching, ideal for 24-hour IR box cameras.

Q: Can CS mount lenses be fitted on C-mount cameras?

A: Yes, a C/CS adapter ring is required. Most standard security box cameras use CS mount for direct installation.

Q: Can the 5-100mm telephoto lens be used to cover large areas such as plazas and parking lots?

A: Not recommended. The telephoto end delivers a narrow FoV, dedicated to remote verification and evidence capture instead of wide panoramic monitoring. 5-50mm is preferred for large open areas.

Q: How to choose between auto iris and manual iris versions?

A: DC auto iris is recommended for outdoor sites with variable lighting, day-night surveillance and AI recognition applications. Manual iris is a cost-saving option for indoor locations with stable illumination.

4. Quick Selection Guide for Customers

• Indoor sites, access gates, close-range face capture → 2.8–12mm
  
• Factory roads, parking lots, gates, mid-range fences → 5–50mm
  
• Long walls, riverbanks, remote yards, elevated verification points → 5–100mm
  
• Small & medium factories, communities with short fences → 2.8–12mm + 5–50mm
  
• Long perimeter, open boundary projects → 5–50mm + 5–100mm
  
• Large logistics parks, industrial parks and photovoltaic sites with mixed short & long distances → Full three-lens set