AXIS T8355 Digital Microphone (01561-001) - Hemispherical Supervised Digital Microphone with S/PDIF Output & Lossless Audio
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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AXIS T8355 Digital Microphone (01561-001) – Hemispherical Supervised Digital Microphone with S/PDIF Output & Lossless Audio.
The AXIS T8355 Digital Microphone is a professional-grade hemispherical microphone designed for high-quality surveillance audio recording. Unlike traditional analogue microphones, it uses a digital S/PDIF interface to transmit audio signals directly to AXIS network devices without quality loss or electromagnetic interference. It captures sound from all directions, making it suitable for open indoor areas such as banks, schools, retail stores, and offices.
The microphone also supports supervised input, meaning it can detect tampering or disconnection and trigger alarms in the system. Powered directly by the connected network device, it requires no external power supply, making installation simple and reliable.
Key Features:
Digital microphone with lossless S/PDIF audio transmission
Hemispherical design (captures sound from all directions)
Supervised input for tamper and fault detection
High resistance to electromagnetic interference (EMI)
Plug-and-play installation with AXIS network cameras
Powered directly by the camera (no external PSU needed)
Supports AXIS Digital Audio Extension Kit (up to 100 m range)
Discreet and compact design for indoor surveillance
Ideal for banks, retail, schools, and offices
Stable, high-quality audio for forensic recording
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