Dahua IPC-HDW3649TP-ZS-IL-27135 6MP WizSense 3 Series Smart Dual Light Motorised Varifocal Eyeball IP Camera (2.7–13.5mm, AI SMD 4.0, IP67)
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-HDW3649TP-ZS-IL-27135 6MP WizSense 3 Series Smart Dual Light Motorised Varifocal Eyeball IP Camera (2.7–13.5mm, AI SMD 4.0, IP67)
The Dahua IPC-HDW3649TP-ZS-IL-27135 is a professional 6MP (3288 × 1850) network eyeball camera from Dahua’s WizSense 3 Series, designed for intelligent, high-accuracy surveillance in commercial, industrial, and critical security environments. It is built around a 1/2.7" progressive CMOS sensor, delivering sharp, detailed imaging with strong performance in both day and low-light conditions. A key feature of this model is its motorised varifocal lens (2.7–13.5mm), which allows remote adjustment of zoom and focus. This makes installation highly flexible, enabling operators to fine-tune coverage after installation—from wide-area scene monitoring to focused long-distance identification—without physically repositioning the camera. The camera uses WizSense AI with SMD 4.0 (Smart Motion Detection), which significantly improves detection accuracy by distinguishing humans and vehicles from irrelevant motion such as animals, rain, shadows, or moving foliage. It also supports advanced perimeter protection functions such as intrusion detection and tripwire events, making it suitable for proactive security deployments
KEY FEATURES
- IP67 weatherproof protection
- PoE (802.3af) and 12V DC power
- MicroSD card support (up to 256GB)
- Built-in microphone
- 3D noise reduction (3D NR)
- 120dB True Wide Dynamic Range (WDR)
- Smart H.265+ / H.264+ compression
- Perimeter protection (intrusion & tripwire)
- SMD 4.0 smart motion detection
- WizSense AI human & vehicle detection
- Up to 40m illumination range
- Smart Dual Light (IR + warm white LED)
- Remote zoom and focus adjustment
- Motorized 2.7–13.5mm varifocal lens
- 1/2.7" progressive CMOS sensor
- 6MP resolution (3288 × 1850)
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