Dahua 4MP DH-SD49425XB-HNR 25x Starlight IR PTZ AI Network Camera

Model: SD49425GB-HNR

Who This Is For

For security integrators and site managers who need a single camera to cover large, open areas where fixed cameras would require multiple units. The Dahua SD49425GB-HNR is built for wide-area outdoor applications - think school grounds, council car parks, industrial yards, transport depots, and commercial perimeters - where the ability to zoom in on distant activity without losing image quality is the core requirement. With a 25x optical zoom reaching a 120mm focal length and Starlight low-light capability down to 0.005 lux in colour mode, this camera is suited to sites that stay active after dark. The WizSense AI perimeter protection filters human and vehicle detections from irrelevant movement, which matters on sites where wind, foliage, and passing traffic would otherwise flood a VMS with false alarms. PoE+ powering keeps the install straightforward where a suitable switch is already in place.

Download Product Datasheet (PDF)

What This Camera Actually Does

Who Buys This Model

• Security integrators on commercial perimeter projects: Sites with long fence lines or large open yards where 1 PTZ with 25x optical zoom replaces 3-4 fixed bullet cameras, reducing cabling and NVR channel cost.
• Council and transport depot operators: Car parks, bus interchanges, and public spaces where operators need to zoom in on incidents in progress without repositioning cameras or deploying personnel.
• Industrial and logistics site managers: Warehouses, container yards, and fuel depots where after-dark coverage with 100m IR reach and human/vehicle AI classification is needed to separate genuine intrusions from ambient movement.
• School and university facility managers: Large campuses where a single PTZ patrolling preset positions overnight reduces the number of monitored camera feeds without sacrificing the ability to zoom in on specific areas on demand.

Honest Assessment

The SD49425GB-HNR does several things genuinely well. The 25x optical zoom with PFA focusing technology delivers sharp images at distance without the soft, blurred results common on lesser PTZ units when fully zoomed. Starlight colour performance at 0.005 lux is a real advantage on semi-lit outdoor sites. SMD Plus AI classification meaningfully reduces nuisance alarms, and the 6KV lightning rating and IP66 build quality suit Australian outdoor conditions. DORI identification distances reach 254m, which is substantial for a 4MP sensor at this zoom ratio. It is available through Security Australia with manufacturer datasheet support. Where this camera is not the right fit: it does not suit indoor applications where a fixed turret or dome is more appropriate and far more cost-effective. Sites requiring licence plate capture at speed, thermal imaging, or multi-lane wide-area coverage in a single unit would need a different product type. PoE+ is required - standard IEEE 802.3af PoE switches will not power this unit.

Before You Buy

Key Features & Technical Specifications

Real-World Scenarios

How It Compares

• Choose this if: You need a single outdoor camera to monitor a large open area, require 25x optical zoom for distant subject detail, and the site has after-dark activity where Starlight colour performance and 100m IR reach matter.
• You may need a different model if: Your priority is capturing licence plate data from moving vehicles at speed - a dedicated ANPR camera is the appropriate product type for that task. Similarly, if budget-per-point is the primary driver on a multi-camera perimeter project, fixed bullet cameras will deliver lower per-position cost.
• Pairs well with: A PoE+ managed switch (to deliver IEEE 802.3at power), a Dahua WizSense NVR for AI event management and local recording, and an SD card for edge backup in the event of network interruption.

Common Questions

1. Will this camera run on a standard PoE switch?

   No. The SD49425GB-HNR requires PoE+ (IEEE 802.3at), which delivers up to 30W per port. Standard PoE (IEEE 802.3af) is capped at 15.4W and will not supply sufficient power for a motorised PTZ mechanism plus the camera sensor and IR illuminators. Confirm your switch or injector is rated for 802.3at before installation.

2. What does SMD Plus actually filter, and how does it differ from standard motion detection?

   SMD Plus uses a deep-learning algorithm to classify moving objects as human or vehicle before generating an alert. Standard pixel-based motion detection fires on any movement - including animals, leaves, rain, and passing vehicle headlights. SMD Plus discards those triggers and only sends an alarm when a human or vehicle is positively classified, which significantly reduces false alarm volume on outdoor sites with environmental movement.

3. Does this camera work with third-party VMS platforms?

   Yes, with ONVIF-compatible platforms. The SD49425GB-HNR is ONVIF compliant, which means it integrates with any VMS that supports the ONVIF standard. Full AI feature access - including SMD Plus alerts and perimeter protection events - is confirmed when using Dahua's SmartPSS or DMSS platforms. AI event data availability on third-party ONVIF connections depends on that platform's ONVIF profile support.

4. How does the 25x optical zoom affect image quality at maximum reach?

   The 25x optical zoom uses physical glass movement rather than digital cropping, so the full 4MP sensor resolution (2560 x 1440) is maintained throughout the zoom range. At 120mm focal length, the horizontal field of view narrows to 2.5 degrees. The PFA (Predictive Focusing Algorithm) technology is designed to maintain sharp focus during zoom transitions and reduce re-focus time - important when operators are zooming quickly to a target during a live incident.

5. What are the DORI distances, and what do they mean practically?

   DORI is a standardised measurement framework with 4 levels - Detect, Observe, Recognise, and Identify - each requiring progressively more pixel density on target. At full zoom, the SD49425GB-HNR's confirmed DORI distances are: Detect 2540m, Observe 1016m, Recognise 508m, and Identify 254m. In practical terms, at 100m the camera has substantial identification-level detail; at 254m you can distinguish facial features and clothing; at 508m you can determine gender and general appearance. These distances are theoretical maximums measured against the DORI standard and assume optimal lighting and atmospheric conditions.

6. How does SmartIR work when zooming in on a close subject?

   SmartIR automatically adjusts IR illuminator intensity based on the current zoom level. Without this, zooming in on a subject close to the camera at full wide-angle IR output would cause severe overexposure - the image washes out to white. SmartIR reduces IR power proportionally as the lens zooms in and the target fills more of the frame, and increases IR output when zoomed out to maintain 100m reach. This is managed automatically without operator input, across all 3 control modes: Zoom Priority, Manual, and SmartIR.

7. Can I use an SD card for recording if the network connection drops?

   Yes. The camera includes an onboard SD card slot for local edge recording. If the network path to your NVR is interrupted, the camera can continue recording to the SD card and resume syncing to the NVR once the connection is restored - depending on your NVR's ANR (Automatic Network Replenishment) capability. The SD card acts as a buffer for continuity of recording, not a replacement for centralised NVR storage.

Downloads & Resources

• Product Spec Sheet (PDF)