AXIS T8351 Mk II Microphone (01560-001) – Hemispherical Analog Surveillance Microphone with 3.5 mm Plug, Low-Noise Audio Capture
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 T8351 Mk II Microphone (01560-001) – Hemispherical Analog Surveillance Microphone with 3.5 mm Plug, Low-Noise Audio Capture.
The AXIS T8351 Mk II Microphone is a professional surveillance audio accessory used to improve sound quality in AXIS video systems. It captures audio in a 360° hemispherical pattern, making it suitable for rooms where voices or activity may come from multiple directions.
The microphone connects directly to compatible AXIS cameras through a 3.5 mm jack or terminal adapter, and it is powered by the camera itself, eliminating the need for an external power supply. This makes installation simple and reliable for environments such as offices, banks, retail stores, and interview rooms where clear audio evidence is important.
Key Features:
Hemispherical (360°) audio pickup pattern
High-quality low-noise surveillance audio capture
3.5 mm plug / 4-pin terminal compatibility
Powered directly by AXIS network devices (no external PSU)
Compact and discreet design for hidden or visible mounting
Suitable for indoor professional surveillance environments
Flexible mounting on walls, ceilings, or concealed locations
Stable audio performance for forensic recording use
Compatible with AXIS cameras supporting external mic input
IP-rated enclosure (model-dependent protection level)
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