AXIS P3935-LR 1080p Fixed Dome Camera (01919-001) – Transportation Grade IR Network Camera with WDR & Lightfinder
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 P3935-LR 1080p Fixed Dome Camera (01919-001) – Transportation Grade IR Network Camera with WDR & Lightfinder.
The AXIS P3935-LR is a professional-grade fixed dome camera built specifically for demanding environments such as buses, trains, and emergency vehicles. It delivers Full HD 1080p video at up to 30 fps using a 1/2.9" CMOS sensor and a 2.8 mm fixed lens with approximately 110° horizontal field of view.
Designed for continuous mobile surveillance, it includes electronic image stabilisation (EIS) to reduce motion blur caused by vibrations. The camera also integrates invisible 940 nm IR illumination for night monitoring, ensuring discreet surveillance in complete darkness. With IP66/IP67 weather resistance, IK10 vandal protection, and advanced cybersecurity features, it is built for harsh, high-movement environments where reliability is critical.
Key Features:
Full HD 1080p resolution (1920 × 1080)
Up to 30 fps smooth video output
2.8 mm fixed wide-angle lens (~110° HFOV)
Built-in invisible IR LEDs (940 nm) for night vision
Lightfinder for color imaging in very low light
Forensic WDR for balanced exposure in difficult lighting
Electronic Image Stabilization (EIS) for moving vehicles
Built-in microphone for audio capture
H.264 / H.265 video compression with Zipstream
Edge storage support via microSD card slot
IP66 / IP67 weather protection
IK10 vandal-resistant housing
Designed for transport, buses, trains, and emergency vehicles
Secure boot & signed firmware for cybersecurity
PoE-powered installation
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