Dahua IPC-HDW3541TP-ZS-27135-S2-Grey 5MP WizSense Smart IR Motorised Varifocal Eyeball IP Camera (2.7–13.5mm, AI Human/Vehicle Detection)
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-HDW3541TP-ZS-27135-S2-Grey 5MP WizSense Smart IR Motorised Varifocal Eyeball IP Camera (2.7–13.5mm, AI Human/Vehicle Detection)
The Dahua IPC-HDW3541TP-ZS-27135-S2-Grey is a professional 5MP network eyeball camera designed for intelligent and adaptable video surveillance in residential, commercial, and industrial environments. It uses a 1/2.7" progressive CMOS sensor to deliver clear video up to 2960 × 1668 resolution, ensuring detailed image quality for monitoring entrances, perimeters, parking areas, and indoor/outdoor security zones. A key feature of this model is its motorised varifocal lens (2.7–13.5mm), which allows remote zoom and focus adjustment after installation. This makes it highly flexible for installations where the field of view must be tuned precisely—ranging from wide-area coverage to focused long-distance observation without physically repositioning the camera. The camera belongs to Dahua’s WizSense AI series, which uses deep-learning algorithms to distinguish humans and vehicles from irrelevant motion such as animals, shadows, or environmental movement. It supports advanced perimeter protection functions like intrusion detection and tripwire events, improving alarm accuracy and reducing false alerts.
KEY FEATURES
- 5MP resolution (2960 × 1668)
- 1/2.7" progressive CMOS sensor
- Motorised 2.7–13.5mm varifocal lens
- Remote zoom and focus adjustment
- Smart IR night vision up to 40m
- WizSense AI human & vehicle classification
- Perimeter protection (intrusion & tripwire)
- Smart motion detection (SMD)
- Smart H.265+ / H.264+ compression
- 120dB True Wide Dynamic Range (WDR)
- 3D noise reduction (3D NR)
- Built-in microphone
- MicroSD support up to 256GB
- PoE (802.3af) and 12V DC power
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