Newbie needs to replace coax system with 4K, very confused.

[David Chan 0]

I have an analogue system with 8 cameras that uses coaxial cable. The system is failing because where the 12 V line meets the camera connector despite it being a push fit, there is corrosion around the connector. The connectors are housed in junction boxes which I have inspected and seem to be full of old spider nests. (Do spiders chew wires?) I have now realised that given the UK is damp, I will need to encase the connection area in silicone to prevent this from happening.

I need a system that has got high resolution, (4K, is this the same thing as 8 MP?) Some cameras will need to cover a wide area and be able to be seen from 40m away, and some will need to be by the front and back door.

I am confused about which system to go for. In my local area NW London, they seem to promote HikVision , and I read about security issues and the Chinese Communist Party, but these days everything seems to be made there, so there is always that risk.

Are there any dealers / suppliers that are in that area where I can pop down? Or are there any recommendations?

Also on the setup side of things I have 4 switches on my network, and where the external cat 5 cable runs into a switch depending on location. Each switch then has a separate connection to the router. I am guessing that with the cam. setup, it may be better to give the cameras a static IP address and start the DHCP pool further up? I can then input the static IP address of the cam into the DVR so it works correctly, or am I missing something.

I will be getting my roof done at some stage, so when that is being done I will defo sort out the camera wiring situation properly and have redundancy built it, but this will not be for another couple of years.

really appreciate your help.

Many thanks.

 

[Mark_M 3]

On 8/18/2024 at 7:40 PM, David Chan said:

I need a system that has got high resolution, (4K, is this the same thing as 8 MP?)

Do you really need 4K/8MP?

Cheap cameras at 8MP tend to have very small cmos imaging sensor size (the thing which takes light and makes it into a digital image). Cheap & small imaging sensors work fine during daylight but tend to have terrible motion ghosting at night.

A common cmos size in 4K cheap cameras is 1/2.7"... that's the size of a decent 2MP/1080P camera. A prober 4K camera should have near 1/1.2" cmos size.

 

Zoom/Focal length is more important to capture an area. A higher 'mm' number is more zoom. E.g. 2.8mm typically 90deg FOV, 4mm ~80deg FOV. https://ipcamtalk.com/tools/calculators/focal/ (Focal length zoom depends on cmos size).

[David Chan 0]

thank you so much for that, yes I am trying to improve my knowledge and there is so much to take on board. When I got my analogue system I didn't have a clue so done want to make the same mistakes again. Also I will be getting my roof done (huge project + expense!!!) so will be able to lay conduits down for CCTV final installation, but for now I need something working that is decent. A lot of the local installers insist on Hikvision , something that I have realised to stay away from.