Compatible DS-1280ZJ-DM21 junction box
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, frame rate settings, and whether you have H.265 encoding enabled or not to save space (We advise turning it on to double the capacity shown below with ease).
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 (to perhaps double or more these figures again).
|
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 2 Terabytes for a 4 x 4/5MP HD camera setup, as this should give you approx 2 weeks using H.265 @ 20fps and that is on continuous, not motion-detected recording.
(You may only require the full 25 frames per second on certain cameras if things are fast-moving - ie above a till)
You can also use the Hikvision online calculator to work out what works best for you specifically: https://tools.hikvision.com/ca...
(All of our hard drives come fitted and are CCTV-specific from one of the major brands)
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Compatible DM21 Junction Box for IP Turret Cameras (Third-Party Alternative)
The Compatible DM21 Junction Box is a high-quality third-party mounting accessory designed for IP turret cameras that utilise the DM21 mounting pattern. Providing a practical and cost-effective alternative to the original manufacturer's accessory, it offers secure cable management while creating a clean and professional camera installation.
Constructed from durable aluminium alloy, the DM21 junction box is built to withstand indoor and outdoor environments. It safely houses network and power cable connections, protecting them from moisture, dust, and accidental damage while improving the overall appearance and reliability of your CCTV installation.
Ideal for new installations and retrofit projects, the DM21 junction box features multiple cable entry options to simplify installation and provide greater flexibility for surface mounting applications.
Key Features:
- Third-party compatible junction box for DM21 IP turret cameras
- Suitable for a wide range of compatible IP turret CCTV cameras
- Robust aluminium alloy construction
- Weather-resistant design for indoor and outdoor installations
- Conceals and protects network and power cable connections
- Side and rear cable entry options for flexible cable routing
- Quick and easy to install
- Clean, professional finish for surface-mounted camera installations
- Cost-effective alternative to OEM mounting accessories
The Compatible DM21 Junction Box is the ideal solution for installers seeking a reliable, durable, and affordable mounting accessory. Designed to provide secure cable protection and a professional finish, it is perfectly suited to residential, commercial, and industrial CCTV applications.
Please note: This is a third-party compatible accessory and is not manufactured by Hikvision. Please verify your camera's mounting pattern and dimensions before purchasing to ensure compatibility.
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