Dahua IPC-HDW3541EMP-S-0280B-S2 5MP WizSense IR Eyeball Network Camera (2.8mm, Smart 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-HDW3541EMP-S-0280B-S2 5MP WizSense IR Eyeball Network Camera (2.8mm, Smart AI Human/Vehicle Detection)
The Dahua IPC-HDW3541EMP-S-0280B-S2 is a professional 5MP network eyeball camera from Dahua’s WizSense series, designed for intelligent video surveillance with efficient AI analytics. It uses a 1/2.7" progressive CMOS sensor to deliver high-quality video up to 2960 × 1668 resolution, providing clear and detailed images suitable for security monitoring in homes, shops, offices, and outdoor environments. This model is equipped with a 2.8mm fixed wide-angle lens, offering broad scene coverage, making it ideal for entrances, corridors, parking areas, and general perimeter monitoring. Its Smart IR system provides night vision illumination up to 50 meters, ensuring clear imaging even in complete darkness. As part of the WizSense AI platform, the camera supports human and vehicle classification, significantly reducing false alarms caused by irrelevant motion such as animals, wind, or shadows. It includes intelligent perimeter protection features like intrusion detection and tripwire analysis for proactive security response.
KEY FEATURES
- 5MP resolution (2960 × 1668)
- 1/2.7" progressive CMOS sensor
- Fixed 2.8mm wide-angle lens
- Smart IR night vision up to 50m
- WizSense AI human & vehicle detection
- 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 for audio recording
- MicroSD card support up to 256GB
- PoE (802.3af) and 12V DC power support
- IP67 weatherproof protection
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