Q:What is the meaning of monitoring the focal length in the camera?

So, you want to see a wide range, to choose a small aperture of the lens, but to see the target will be smaller.

Q:Monitor the difference between the camera 720p and 1200 lines

1200 lines, if simply literally on the analog camera system that represents the clarity of the 1200 TV line, but the current market, the emergence of the 1200 line, strictly speaking, is a mountain plug products, is a digital camera using 1080 X 1960 CMOS lens to convert products into analog cameras.

Q:Can the general camera be monitored?

Ordinary camera: ordinary personal computer + ordinary USB camera + software, the establishment of cheap USB camera monitoring system. Applicable to individuals who do not have any requirements.

Q:Hello, because no electric video recorder did not manually set, but I would like to look back a few days before the monitor can be transferred out

3, the operator will not operate the hard disk video recorder, did not correctly follow the normal steps to call the DVR video. 4, hard disk video recorder motherboard problems.

Q:Outdoor surveillance camera what brand good ah

According to the camera brand, then the following brands are very good.

Q:What kind of surveillance camera is good

The performance of the camera is mainly the minimum illumination (that is, the ability to adapt to the dark light), focal length (according to your workshop to install the camera position and to monitor the range of fixed focus, the shorter the shorter the focal length of the larger image is not very clear

Q:Monitor the image of the camera appeared black and white colorless situation, is this how is it?

What about the surrounding environment? If the ambient light is poor, there will be black and white screen. If you take into account the machine itself, the photoresistor may be broken and can not be switched.

Q:Monitor how the camera will suddenly no color

2, the normal light, manual control with a switching function of the camera to black and white mode;

Q:How does the surveillance camera solve the backlight problem?

Second, always use the corresponding function of the camera, improve the backlit appearance. There are two kinds of cameras inside the security camera can be better to deal with the problem of camera backlight, one is a backlight compensation function of the camera, one is wide dynamic camera. Backlight compensation, also known as backlight compensation, is the screen dividends of several different areas, each area from the exposure. In some applications, the field of view can contain a very bright area, and the subject is included in the bright field surrounded by a picture of a bleak, no level. At this point because the AGC detects the signal level is not low, so the amplifier gain is very low, can not improve the brightness of the main screen, when the introduction of backlight compensation, the camera only the entire field of view of a sub-region, Area of the uniform signal level to determine the AGC circuit operating point.

Q:Monitor video recorder, how do two video recorders show a display? Video recorder can not be connected with the exchange of two video recorders

This is the family. Or you want to use a video recorder connected to two monitors, a fool switch, switch on two network DVR, dozens of dollars, with two wasted, and then connected to the two monitors, you can do this: a network camera access switch. Plus a four-point video distributor. (If you have to use two video recorders, or use the computer to store, select the BNC interface, with wifi module web camera, two monitors. (Display and video recorder must have BNC interface, a hard disk recorders, switches connected to the network DVR.