Dahua DH-SD49225-HC-LA1 2MP 25x Starlight IR PTZ HDCVI Camera, Motorized 4.8~120mm Lens

Model: DH-SD49225-HC-LA1

Who This Is For

When replacing an existing coaxial CCTV system without re-cabling is the priority, the Dahua DH-SD49225-HC-LA1 gives installers a straightforward path to PTZ performance over existing coax infrastructure. This 2MP HDCVI PTZ delivers 25x optical zoom across a 4.8-120mm motorised lens range, IR illumination to 100 metres, and Starlight low-light sensitivity down to 0.005 Lux in colour - all transmitted over the same RG59 or RG6 coaxial cabling already in the wall. It suits large open sites where a single camera position needs to cover vast distances: carparks, school grounds, industrial yards, perimeter fences, and transport depots. The 120dB true WDR handles entry gates and loading areas where bright sunlight and deep shadows appear in the same frame. For organisations invested in HDCVI recorders who need active PTZ control without an IP network infrastructure upgrade, this camera is a direct fit.

What This Camera Actually Does

Who Buys This Model

• Schools and university campuses: Large grounds require active PTZ control to sweep oval areas, carparks, and entry points from a single camera position - the 25x optical zoom and 100m IR cover distances that would otherwise require multiple fixed cameras.
• Industrial yard and depot operators: Sites with existing coaxial HDCVI infrastructure who need to add PTZ coverage to loading docks or perimeter fencing without rewiring - HDCVI delivers PTZ control and HD video over the existing cable run.
• Security integrators upgrading legacy analog systems: Installers replacing older SD analog PTZ cameras on coax runs where the client wants improved image quality and zoom range without a full IP network infrastructure overhaul.
• Transport and logistics facilities: Truck yards and container parks with challenging lighting - bright midday sun at entry gates and complete darkness in unlit zones overnight - where the 120dB WDR and Starlight sensor handle both extremes.
• Council and public space operators: Wide open areas like parks, recreational grounds, and public carparks where a single PTZ camera covering detection distances beyond 1,600 metres reduces overall camera count and infrastructure costs.

Honest Assessment

The DH-SD49225-HC-LA1 does the core PTZ job well: the 25x optical zoom is genuine and lossless, the Starlight sensor produces usable colour in low light that most PTZ cameras in this class cannot match, and the HDCVI architecture is a significant practical advantage for sites with coaxial cabling already installed. The IP66 housing and 6kV lightning protection rating make it appropriate for exposed outdoor mounting positions. For sites wanting to upgrade PTZ image quality without touching existing cable infrastructure, the value proposition is straightforward.

Where this camera will not serve is any project requiring IP network integration, ONVIF compatibility, or edge-based AI analytics - HDCVI is a closed ecosystem requiring compatible Dahua HDCVI recorders at the head end. It is also not suitable where optical zoom beyond 25x is required; sites needing 30x or 40x zoom should look at the IP PTZ range available through Security Australia. The 2MP resolution, while sufficient for general surveillance, will not meet requirements where facial identification at long range is a formal project objective.

Before You Buy

Quick Fit Check

• Good match if: Your site already has coaxial HDCVI infrastructure and you need to add or replace a PTZ camera with genuine 25x optical zoom, 100m IR, and Starlight low-light performance without running new Cat6 cable.
• Good match if: You are monitoring a large open area - industrial yard, carpark, or open grounds - where a single motorised PTZ position needs to detect movement at over 1,600 metres or observe subjects at over 650 metres with the ability to zoom in for detail.
• You may need a different model if: Your project is IP-network based, requires ONVIF integration, edge AI analytics, or optical zoom beyond 25x - an IP PTZ camera would be the more suitable product type for those requirements.

Key Features & Technical Specifications

Real-World Scenarios

How It Compares

• Choose this if: Your site has existing HDCVI coaxial infrastructure and you need genuine 25x optical PTZ performance with Starlight low-light sensitivity and 100m IR without laying new network cable.
• You may need a different model if: Your project requires IP network integration, ONVIF compatibility, edge AI analytics, optical zoom beyond 25x, or higher than 2MP resolution - an IP PTZ camera would be the appropriate product type for those requirements.
• Pairs well with: Compatible Dahua HDCVI recorders with PTZ-capable coax outputs and multi-channel HDCVI recorders for sites combining this PTZ with fixed HDCVI cameras across the same coax infrastructure.

Common Questions

1. Will this camera work with my existing IP NVR?

   No. The DH-SD49225-HC-LA1 uses HDCVI technology, which is not compatible with IP NVRs or ONVIF-based systems. It requires a Dahua HDCVI recorder with a BNC input that supports HDCVI PTZ control. If your existing recorder is IP-only, you would need either an HDCVI recorder or a different IP PTZ camera to suit your current infrastructure.

2. What is the actual optical zoom ratio and how does it affect the field of view?

   The optical zoom ratio is 25x, covering a focal length range of 4.8mm to 120mm. At the widest setting, the horizontal field of view is 58.5 degrees - suitable for broad scene coverage. At full 25x zoom, the horizontal field of view narrows to 2.8 degrees, allowing the camera to resolve fine detail at long distances. There is no digital zoom degradation within this range as it is entirely optical.

3. What are the DORI distances and what do they actually mean for my site?

   DORI distances for the DH-SD49225-HC-LA1 at full 25x zoom are: Detect 1,655m, Observe 657m, Recognise 331m, and Identify 166m. In practical terms: at 1,655m the camera can confirm something is present and moving; at 657m you can determine it is a person or vehicle; at 331m you can distinguish facial features or read a vehicle type; at 166m you can identify a specific individual or read a number plate. These are theoretical maximums under optimal lighting and should be used as planning guides, not guaranteed outcomes.

4. Does this camera support auto-tracking of moving subjects?

   Auto-tracking capability is not confirmed in the specification data for this model. The DH-SD49225-HC-LA1 is operator-controlled via a compatible HDCVI PTZ recorder. Pan, tilt, and zoom are managed manually through the recorder interface or joystick controller. If auto-tracking is a project requirement, an IP PTZ camera with confirmed auto-tracking support would be the appropriate product type to specify.

5. How does the PFA focus technology behave when zooming quickly?

   PFA (Predictive Focusing Algorithm) technology uses advanced algorithms to anticipate the required focus position as the lens zooms, reducing the time the image spends soft or out of focus during a zoom operation. In standard PTZ cameras without this feature, rapid zoom changes can result in several seconds of blurred video while autofocus searches. PFA shortens this settling time and maintains sharpness more consistently throughout the zoom range - relevant for active PTZ operation where operators are zooming in quickly to investigate movement.

6. Does this camera require PoE or a separate power supply?

   This camera does not use PoE. As an HDCVI PTZ camera, it requires a dedicated power supply - DC12V or AC24V - separate from the coaxial video and control cable. Power must be run independently to the camera mounting location. This is a standard requirement for HDCVI PTZ cameras and should be factored into your cable run and power budget planning. Confirm power supply specifications with your HDCVI recorder documentation before installation.

7. Will this camera perform in a site that gets direct lightning exposure?

   Yes, to a confirmed degree. The DH-SD49225-HC-LA1 carries a 6kV lightning protection rating on its housing and structure, providing a level of surge protection against induced lightning effects through the coaxial cable run and mounting structure. This does not make the camera immune to a direct lightning strike but does protect against the surge energy that commonly travels through cable infrastructure during nearby strikes - a meaningful specification for cameras installed on exposed poles, rooftops, or rural perimeter fencing. For critical installations, earthing the mounting bracket and using surge protection devices on the coax run is still recommended practice, available through Security Australia alongside compatible accessories.

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