Lens extra digital 03518DC HD 1/2" 3.5-18mm for CCTV and security cameras

Lens extra digital 03518DC HD 1/2" 3.5-18mm is a varifocal lens designed for 1/2" image sensors used in CCTV and security cameras. The 3.5–18mm focal range allows adjustment from a wide-angle view to moderate telephoto, enabling flexible framing and efficient scene coverage. The lens is built in a compact metal housing and provides manual zoom and focus control for precise optical setup in both indoor and outdoor surveillance installations.

Advantages

This HD varifocal lens offers a versatile focal range that adapts to different monitoring requirements without changing the camera. Manual zoom and focus rings allow accurate optical adjustment on site. The compact metal construction ensures stable mounting and long-term mechanical durability. Optimized for 1/2" sensors, the lens delivers suitable image projection and field of view for many CCTV applications.

Suitable for

• Indoor surveillance in offices, retail and public spaces
• Outdoor monitoring of building entrances, parking areas and perimeters
• General-purpose CCTV installations where adjustable framing is required
• Replacement or upgrade of existing 1/2" sensor camera optics

Key specifications

• Mount type: compatible with cameras using 1/2" image sensors
• Focal length: 3.5–18mm (varifocal)
• Aperture: fixed or variable aperture appropriate for HD surveillance optics
• Focus type: manual focus control
• Zoom control: manual zoom ring for focal length adjustment
• Housing: metal compact body suitable for mounted camera use
• Optical format coverage: designed to cover 1/2" sensor area

How to use

Install the lens onto a compatible camera following the camera manufacturer's mounting instructions. Use the manual zoom ring to set the desired focal length between 3.5 and 18mm, then adjust the focus ring until the scene is sharp on the camera monitor. Secure the lens with set screws or locking mechanisms provided by the camera or lens mount to prevent movement. Fine-tune focus and framing under typical lighting conditions for the intended surveillance environment.

Usage recommendations

For best results, perform final focus and framing adjustments with the camera connected to its recording or monitoring system at the target resolution. When used outdoors, pair the lens with a weatherproof camera housing and consider IR-compatibility if night-time surveillance with infrared illumination is required.