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Video surveillance lenses play a critical role in video surveillance systems, as they're responsible for capturing real-time outdoor scenes and projecting them onto a screen. The collaboration between surveillance cameras and lenses is fundamental to the effectiveness of video monitoring.

I. What Are Video Surveillance Lenses?
Video surveillance lenses are in charge of capturing real-time video signals on-site and serve as the primary source of raw signals for the entire video image management system.

II. Classification of Video Surveillance Lenses
There's a wide array of surveillance cameras, and the way lenses are categorized can vary depending on the user's requirements. Here, we'll delve into the classification of video surveillance lenses.

1. Based on Focal Length:
- Short-Focus Video Surveillance Lenses
- Medium-Focus Video Surveillance Lenses
- Long-Focus Video Surveillance Lenses

2. Based on Field of View:
- Wide-Angle Lenses
- Standard Lenses
- Telephoto Lenses

3. Based on Structure:
- Fixed Aperture Fixed-Focus Lenses
- Manual Aperture Fixed-Focus Lenses
- Auto Aperture Fixed-Focus Lenses
- Manual Aperture Zoom Lenses
- Auto Zoom Lenses
- Auto Aperture Motorized Zoom Lenses
- Motorized Three-Variable Lenses (Aperture, Focal Length, Focus)

III. Applications of Video Surveillance Lenses
Video surveillance lenses find a multitude of applications due to the diversity of surveillance cameras and lenses. Here, we will primarily focus on applications based on the classification of video surveillance lenses.

1. High-Definition Network Cameras:
- High-definition network cameras encompass high-definition intelligent dome cameras, high-definition network PTZ cameras, and high-definition network mini-dome cameras. These cameras are primarily used in critical surveillance areas and complex environments that require high-quality images.

2. Standard-Definition Network Cameras:
- Standard-definition network cameras, including standard-definition network intelligent dome cameras, standard-definition network PTZ cameras, and standard-definition network mini-dome cameras, support the capture of standard-definition video images. They are mainly employed in surveillance locations with less stringent image resolution requirements.

3. Infrared Surveillance Cameras:
- Infrared surveillance cameras consist of infrared PTZ cameras, infrared bullet cameras, and infrared mini-dome surveillance cameras. These cameras feature infrared illumination and are suitable for low-light conditions, making them ideal for nighttime surveillance in poorly lit areas.