What Is a CCTV Camera? Types of CCTV Cameras Explained

A CCTV (Closed-Circuit Television) camera is a specialized video surveillance camera that captures light through a lens and image sensor and transmits the video signal to a private, closed set of recording devices (a DVR, NVR, or encrypted cloud server) and authorized monitors. Unlike public broadcast television—where any television receiver with an antenna can tune into the signal—a CCTV feed is restricted (“closed”) to specific users on a private cable or network loop.

When homeowners, business owners, or new technicians ask, “How many types of CCTV cameras are there?”, the most practical way to answer is to group them into 12 core camera types across three categories:

1. 8 Types by Physical Shape (Form Factor): Dome, Turret (Eyeball), Bullet, PTZ (Pan-Tilt-Zoom), C-Mount / Box, Fisheye (360-Degree), Multisensor, and Discreet / Pinhole cameras.
2. 2 Types by Signal & Cabling Architecture: HD Analog (Coaxial) and Network / IP (Ethernet PoE or Wi-Fi).
3. 2 Types by Night-Vision & Specialty Imaging: Infrared (IR) vs. Full-Color / Starlight Low-Light cameras, and Thermal / ANPR (License Plate Recognition) cameras.

Below, Drawing on 14 years of field installation and CCTV helpdesk troubleshooting experience, we break down how a CCTV system works, compare all 12 camera types side-by-side, and show you exactly which camera belongs in each location.

How Does a CCTV Camera System Work?

Every modern CCTV installation relies on four connected stages to capture, process, store, and display video:

1. Image Capture (Lens + CMOS Sensor): Light from the scene passes through the camera lens (such as a wide-angle 2.8mm lens or a narrower 4mm to 12mm lens) onto a digital CMOS (Complementary Metal-Oxide Semiconductor) image sensor, which converts light photons into electrical signals.
2. Signal Transmission (Coaxial vs. Network Cable):
   • In an HD Analog CCTV system, the camera sends an uncompressed high-definition video signal over a coaxial cable (RG59 or RG6) using BNC connectors to a recorder, while a separate 12V DC wire supplies power.
   • In an IP (Internet Protocol) CCTV system, the camera’s onboard processor compresses the video inside the camera (using codecs like H.264, H.265, or H.265+) and sends digital data packets over a Cat5e or Cat6 Ethernet cable. With PoE (Power over Ethernet), a single Ethernet cable carries both electrical power and video data.
3. Video Recording & Storage (DVR or NVR):
   • Analog cameras connect to a DVR (Digital Video Recorder), which converts the incoming analog signal into digital files and writes them to a surveillance-grade internal hard drive. (See our complete guide on What Is a DVR and How Many Types of DVR Are There).
   • IP cameras connect to an NVR (Network Video Recorder) or PoE switch, which receives the pre-encoded digital stream and stores it on the hard drive.
4. Live Viewing & Playback: You view live feeds and search recorded clips locally on an HDMI/VGA monitor connected to the recorder, or remotely via an encrypted smartphone app or PC client software.

Quick Comparison Table: All Types of CCTV Cameras

Use this quick-reference matrix to compare each CCTV camera type by its best mounting location, viewing coverage, and primary field limitation:

Part 1: Types of CCTV Cameras by Shape (Form Factor)

The outer housing of a camera is not just about aesthetics—it dictates how well the camera resists rain, dust, spider webs, infrared glare, and physical tampering.

1. Dome CCTV Cameras

Named after their hemispherical clear polycarbonate bubble, dome cameras are most commonly mounted on indoor ceilings in offices, retail shops, hotels, and apartment hallways.

• Why Installers Use Them: The tinted or smoked dome cover makes it difficult for bystanders to see exactly which direction the lens is pointing, and heavy-duty models carry an IK10 vandal-resistance rating (capable of withstanding a 20-joule physical impact, equivalent to a 5 kg weight dropped from 40 cm).
• Field Technician Warning (IR Reflection): Avoid mounting standard glass-bubble dome cameras outdoors in dusty or rainy areas unless necessary. When dust, water spots, or scratches accumulate on the outside of the plastic bubble, or if the internal foam ring around the lens shifts, the infrared (IR) LEDs reflect off the inside of the dome glass and create a foggy white halo at night.

2. Turret (Eyeball) CCTV Cameras

Often called eyeball cameras, a turret camera uses a ball-and-socket joint sitting inside a flat-faced circular housing—without a curved glass bubble covering the front.

• Why Installers Prefer Them: Because the camera lens and the infrared/warm-light LED window sit behind flat, separated glass panels, turret cameras completely eliminate the internal IR reflection issue that plagues dome cameras. Their three-axis ball joint also allows you to mount them cleanly on either a horizontal ceiling/eave or a vertical wall without needing an L-bracket.
• Best Use Case: Residential soffits/eaves, shopfronts, covered walkways, and indoor rooms where you want a compact footprint with crystal-clear night vision.

3. Bullet CCTV Cameras

Bullet cameras have a long, cylindrical barrel housing with an integrated sunshield/rain lip on top and an adjustable mounting arm at the back.

• Why Installers Use Them: Bullet cameras are built to be seen—their unmistakable profile acts as an immediate psychological deterrent against trespassers. Because their housing is larger than a dome or turret, manufacturers can pack larger telephoto lenses and stronger infrared arrays inside, giving bullet cameras a longer night-vision range (often 40m to 80m).
• Field Technician Warning: Because bullet cameras stick out on an arm, spider webs frequently build across the front sunshield lip (attracted by the warmth of the IR LEDs), and someone with a long stick can push the camera out of alignment if it is mounted below 8 to 10 feet (2.5 to 3 meters).

4. PTZ (Pan-Tilt-Zoom) Cameras

A PTZ camera features motorized servos that allow a security operator—or an automated AI tracking rule—to Pan (rotate horizontally up to 360 degrees), Tilt (move vertically up and down), and Zoom in optically on distant targets.

• Optical Zoom vs. Digital Zoom: Unlike standard fixed cameras where pinching to zoom on your phone simply enlarges pixels (digital zoom), a PTZ camera physically moves internal glass lens elements (12x, 25x, or 40x optical zoom) so you can read a license plate or identify a face over 100 meters away without losing clarity.
• Field Technician Warning: A PTZ camera only records the area it is actively pointing at. Never replace three fixed perimeter cameras with a single PTZ camera unless you use a dual-lens “TandemVu / Duo” PTZ (which combines a fixed wide-angle lens on top with a moving PTZ lens on the bottom).

5. C-Mount / Box CCTV Cameras

Box cameras (historically called C-Mount or CS-Mount cameras) consist of a rectangular camera body with a threaded front ring that accepts interchangeable lenses.

• Best Use Case: Industrial inspection lines, highway monitoring, or long-distance gate surveillance where a standard 2.8mm or 4mm lens cannot reach and a specialized 50mm or 100mm telephoto lens is required. For outdoor use, the box camera must be placed inside a separate weatherproof enclosure with a heater/blower.

6. Fisheye (360-Degree Panoramic) Cameras

A fisheye camera uses an ultra-wide-angle lens (typically 1.1mm to 1.8mm) to capture a full 360-degree bird’s-eye view when mounted in the center of a ceiling, or a 180-degree view when mounted on a wall.

• Best Use Case: Retail store floors, classroom centers, warehouse intersections, and small lobbies where you want complete situational awareness from a single cable run. Modern NVRs and VMS software “de-warp” the circular image into four virtual flat views (ePTZ).

7. Multisensor Panoramic Cameras

Unlike a fisheye camera (which stretches one sensor across 360 degrees), a multisensor camera houses two, three, or four independent camera modules inside a single housing, stitching their images together into a seamless 180-degree, 270-degree, or 360-degree high-resolution panorama.

• Best Use Case: Large parking lots, building corners, and school courtyards where you want wide coverage without sacrificing pixel density. Note that multisensor IP cameras typically draw more power and require PoE+ (IEEE 802.3at) or PoE++ (IEEE 802.3bt).

8. Discreet / Pinhole (ATM & Commercial) Cameras

Pinhole or miniature modular cameras place a tiny lens assembly at the end of a flexible cable connected to a hidden main processor box.

• Best Use Case: Bank ATMs, teller windows, and high-security point-of-sale kiosks where a full-sized camera housing cannot fit.
• Legal Warning: Discreet cameras must only be used in lawful commercial security applications with proper surveillance signage. Installing hidden cameras in private areas (such as restrooms, changing rooms, or private residences without consent) is strictly illegal.

Part 2: Types of CCTV Cameras by Signal & Connection Technology

Beyond physical shape, every CCTV camera falls into one of two signal architectures: HD Analog or Network / IP.

9. Analog & HD-over-Coax CCTV Cameras (CVBS, HD-TVI, HD-CVI, AHD)

A common misconception online is that all analog CCTV cameras are stuck at grainy standard definition or 720p. In reality, analog CCTV exists in two generations:

• Legacy Analog (CVBS / 960H): Older standard-definition cameras used in the 1990s and 2000s. These are obsolete today.
• Modern HD-over-Coax (HD-TVI, HD-CVI, AHD): Introduced by major manufacturers (such as Hikvision’s TurboHD/TVI and Dahua’s HDCVI), modern HD Analog cameras transmit 2MP (1080p), 4MP, 5MP, and even 8MP (4K) video over traditional RG59 or RG6 coaxial cable up to 300–500 meters without boosters.
• Cabling & Power: Typically wired using 3+1 or RG59 Siamese cable, which bundles one coaxial video core with a two-core power wire connected to a centralized 12V DC SMPS power supply box at the DVR. Some newer models also support PoC (Power over Coax).

10. Network / IP Cameras (Wired PoE & Wireless Wi-Fi / 4G)

An IP (Internet Protocol) camera is a standalone networked computer with a lens. It captures the image, encodes it digitally inside the camera, and transmits it over a Local Area Network (LAN) or the internet. (For a deep dive into IP camera internals, read our Complete Guide to What Is an IP Camera).

• Wired PoE IP Cameras: Connect to a PoE Switch or PoE NVR using a single solid bare copper Cat5e or Cat6 Ethernet cable up to 100 meters (328 feet) per standard Ethernet segment. Standardized Active PoE (IEEE 802.3af/at) safely negotiates 48V DC power and data over the same cable.
• Wireless (Wi-Fi & 4G LTE) IP Cameras: Transmit video over 2.4 GHz / 5 GHz Wi-Fi or a 4G cellular SIM card. Keep in mind that most “wireless” Wi-Fi cameras still require a physical power cord plugged into a wall outlet unless they run on a rechargeable battery and solar panel. (Compare both options in our guide on Wired vs. Wireless CCTV Camera Systems).
• Brand Compatibility (ONVIF): Most professional IP cameras support ONVIF (Profile S for video streaming, Profile G for edge storage, Profile T for H.265/WDR imaging, and Profile M for AI metadata), allowing you to connect a camera from one brand to an NVR from another brand. Learn how to configure cross-brand setups in our guide: What Is ONVIF in CCTV? Camera Compatibility Explained.

Part 3: Types of CCTV Cameras by Night Vision & Specialty Function

11. Infrared (IR) Day/Night vs. Full-Color / Starlight Cameras

Available in both HD Analog and IP models, low-light cameras use three distinct technologies to record in the dark (covered in detail in our guide: Can CCTV Cameras See in the Dark?):

• Standard IR (Infrared) Day/Night Cameras: During the day, an automatic mechanical IR-Cut Filter (ICR) blocks infrared light so daytime colors look natural. At night, the filter moves aside with an audible click, the built-in 850nm infrared LEDs turn on, and the camera records a sharp black-and-white image in total darkness.
• Starlight / Ultra-Low-Light Cameras: Use a larger CMOS sensor (such as 1/1.8" instead of 1/2.8") and a wide-aperture lens (F1.2 or F1.0) to maintain full color video using only minimal ambient light from a distant streetlamp or porch light.
• Warm-Light Full-Color Cameras (e.g., ColorVu / Full-Color / Smart Dual-Light): Pair an ultra-sensitive sensor with a soft, visible warm-white LED light to record 24/7 full-color footage even in pitch darkness—critical for identifying the color of a suspect’s clothing or a vehicle. Smart Dual-Light models stay in invisible IR mode at night and only switch on the white light when a human or vehicle enters the frame.

12. Thermal & ANPR / LPR (License Plate Recognition) Cameras

• ANPR / LPR Cameras: Standard security cameras often see a glowing white blur when car headlights shine directly into the lens at night. Dedicated ANPR (Automatic Number Plate Recognition) cameras use specialized fast shutter speeds (1/1000s to 1/10,000s), HLC (Highlight Compensation), and tuned IR wavelengths to capture readable license plates on moving vehicles day or night. (See how to fix headlight glare on standard cameras in WDR vs. BLC vs. HLC in CCTV).
• Thermal Imaging Cameras: Instead of visible light, thermal cameras detect infrared heat radiation emitted by objects, people, or overheated electrical transformers. They can detect a human intruder through total darkness, heavy fog, smoke, or light foliage across hundreds of meters.

Step-by-Step: How to Choose the Right CCTV Camera for Your Site

Before buying cameras or drilling holes, follow this 5-step field checklist to avoid the Top 10 CCTV Installation Mistakes:

1. Map Each Camera’s Goal Using DORI (Detect vs. Identify):
   • Ask what each camera needs to achieve. A 2.8mm wide-angle lens gives you a broad 100°–110° overview of a room or yard, but faces become small beyond 6 to 8 meters. For a driveway gate, cash register, or narrow hallway, choose a 4mm, 6mm, or motorized varifocal (2.8–12mm) lens to concentrate pixels on faces and license plates.
2. Match the Housing to the Environment (Check IP Rating):
   • Indoors: Use Dome or Turret cameras.
   • Outdoors: Use Turret or Bullet cameras rated at least IP66 (protected against powerful water jets) or IP67 (protected against temporary water immersion up to 1 meter) under the IEC 60529 Ingress Protection standard.
3. Choose Your Cabling Platform (HD Coax vs. PoE IP):
   • If you are upgrading an older building that already has intact RG59 coaxial cables inside the walls, HD Analog (5MP/8MP TVI or CVI) saves significant labor cost.
   • For any new installation, PoE IP Cameras over solid bare copper Cat6 cable (never cheap Copper-Clad Aluminum / CCA cable, which causes voltage drop and night-vision dropouts) offer cleaner wiring, higher resolutions, and smart human/vehicle AI alerts.
4. Check Difficult Lighting Conditions:
   • If an indoor camera points toward a glass entrance door with bright sunlight outside, choose a camera with True WDR (120dB Wide Dynamic Range) so visitors’ faces aren’t silhouetted in dark shadow.
5. Calculate Your Hard Drive Storage Before Buying:
   • Higher-resolution cameras (4MP and 8MP/4K) consume significantly more storage space than 2MP (1080p) cameras. Enable H.265 / H.265+ compression on your DVR/NVR and run your camera count through our free HDD Calculator to size your surveillance hard drive accurately.

Essential Safety, Cybersecurity & Legal Warnings

Installing a CCTV system carries important network security, electrical, and legal responsibilities:

• Cybersecurity Warning (Never Use Default Passwords or Raw Port Forwarding): Always set a strong, unique administrator password during initialization. Avoid opening router ports (Port 80, Port 554, Port 8000/37777) via manual port forwarding or UPnP to view cameras over the internet—exposed DVR/NVR ports are constantly scanned by automated botnets. Instead, use the manufacturer’s encrypted P2P cloud service with Two-Factor Authentication (2FA) enabled, or connect through a private VPN, and keep camera firmware updated per CISA IoT Security Guidelines.
• Electrical & PoE Cabling Safety: When using PoE IP cameras, use IEEE 802.3af/at compliant PoE switches or NVRs. If using 12V passive power injectors, never plug an energized passive injector lead into a standard laptop or router LAN port, as unregulated voltage can damage non-PoE network interface cards. Always route outdoor cables inside weatherproof PVC conduit and use weatherproof junction boxes to protect RJ45 and BNC connections from moisture corrosion and short circuits.
• Privacy, Signage & Audio Laws: Never aim cameras into neighbors’ private windows or install cameras in areas where individuals have a legal expectation of privacy (bathrooms, locker rooms, changing areas). In most jurisdictions (including India, the UK, and the US), commercial properties must display clear CCTV Surveillance Disclaimer Signage, and recording audio via built-in camera microphones may require explicit consent under local wiretapping and data-protection laws. For court admissibility rules, see our guide on Rules for Using CCTV Footage as Evidence.

Frequently Asked Questions (FAQs)