You want to purchase CCTV cameras but the choices abound.
It is therefore to properly determine your requirements and needs in terms of security. For this, I invite you to ask yourself these different issues.
A dome camera or a camera tube?
The question is only cosmetic but still is of interest to your expectations. Indeed, the domes have the advantage of beingquieter and of onc better fit , especially indoors, in the room architecture. The domes are attached usually to the horizontal, even if they can perfectly be used for vertical mounting to the extent that it has a steerable lens on 3 axes.
Conversely, the tubes are less discreet cameras which therefore makes them more dissuasive . They are easily adjustable and also bind well to the wall on the ceiling. Another advantage of the tube cameras, they have a visor . This allows the lens to be more easily protected from rain and sunlight. Ideal for outdoor use.
Indoor or outdoor use?
The question now is to know where you want to fix your cameras. Indeed, it is on the market for waterproof cameras and others that are not. A camera (dome or tube) will have sealed the IP66 which means the cameras resistant to water jets and dust. They are therefore compatible external.
What field of vision?
There are 2 types of camera: cameras with a fixed lens and cameras varifocal.
The goals set are typically 3.6mm or an angle of view of 90 ° (ideal for fixing in the corner of a room). But, there are cameras at fixed wide angle lens of 2.5 mm , which represents an angle of view of 120 °.
Meanwhile, there are varifocal cameras have an adjustable lens manually on the camera. There are different focal amplitudes although the most common are 2.8-12mm.
In other words, more the size of the lens, the greater the viewing angle is narrower and the scene will be filmed later.
Conversely, the higher the lens size, the faster the scene will be filmed off.
What brightness (lux)?
The brightness of a camera, it’s reflecting the minimum amount of light needed for the camera to work in “day” (before switching to infrared for cameras which feature IR LEDs). It is measured in lux 0 lux which is equivalent to a total darkness and 50 000 lux at maximum brightness. So if you want to always have a picture in “day” mode (color), you must carefully consider the brightness of the area to monitor and chosir the camera accordingly.
Need a night vision, infrared what scope?
If this question could still arise in the last few years, it has virtually no places to be today, the reason a lot of video surveillance cameras sold as CCTV systems today have built-in infrared LEDs.
The real question to ask then is what I wish IR range for my cameras.
Very often the IR camera range goes along with the capacity of its goal to shoot away. Simply put, there is no point of having an infrared range of 50 meters to a target of 3.6mm. There are now filter with IR cameras to trigger the infrared LEDs automatically from a certain brightness.
You should know that infrared light is not visible to the naked eye and generates no light beam.
A fixed camera or a controllable camera ?
This aspect plays a lot on the price, so it is especially important to ask the right question: Do I really need a controllable camera? Although some PTZ (Pan Tilt Zoom) have an automatic round function which make the “stand alone”, a mobile camera finds use as if an operator is behind to the pilot .
Thus, for a stand-alone video without dedicated staff, it is better to focus more fixed cameras covering the same area that a controllable camera. You will have better coverage of the monitored area and a budget often lighter.