Dahua IPC-HFW2849TP-ZAS-IL-27135 – 8MP WizSense Motorised Varifocal Smart Dual Light AI Bullet Camera
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution and frame rate settings. Finally you can often make your storage space last a lot longer by enabling motion detected recording rather than continuous, especially if there are long periods of no activity.
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb we recommend a minimum of 2 Terabytes per 4 x 2-4MP HD cameras, as this should give you 2 weeks to a month with a few adjustments on motion detected recording. You may only require the full 25 frames per second on certain cameras if things are fast moving.
(All of our hard drives come fitted and are CCTV specific from one of the major brands)
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Dahua IPC-HFW2849TP-ZAS-IL-27135 – 8MP WizSense Motorised Varifocal Smart Dual Light AI Bullet Camera
The Dahua IPC-HFW2849TP-ZAS-IL-27135 is part of the WizSense 2 Series Smart Dual Light lineup, designed for intelligent, high-accuracy video surveillance in demanding security applications. It is equipped with an 8MP (3840 × 2160) 1/2.7" progressive CMOS sensor, providing ultra-high-definition video with excellent clarity and detail, suitable for large perimeter areas such as industrial sites, commercial buildings, and public spaces. A key feature of this model is its motorised varifocal lens (2.7 mm – 13.5 mm), allowing remote zoom and focus adjustment. This provides installation flexibility, enabling precise field-of-view configuration without manual adjustment after installation. The camera uses Smart Dual Light technology, combining infrared illumination with warm white light. In standard conditions, IR illumination is used for discreet monitoring. When human or vehicle activity is detected, the warm light automatically activates, producing full-colour video evidence for improved identification accuracy.
KEY FEATURES
- 8MP ultra HD resolution (3840 × 2160)
- 1/2.7" progressive CMOS sensor
- Motorised varifocal lens (2.7 mm – 13.5 mm)
- Remote zoom and focus adjustment
- Smart Dual Light technology (IR + warm light)
- AI human and vehicle classification
- SMD Plus intelligent motion detection
- Perimeter protection (intrusion & tripwire detection)
- 120 dB True WDR for high dynamic scenes
- Smart H.265+ compression
- MicroSD support up to 256 GB
- IP67 weatherproof metal housing
- PoE (IEEE 802.3af) support
- Designed for flexible long-range surveillance
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