Q:Seeking a few surveillance camera manufacturers

Hai Kang, Dahua, Yu as, with the Corning are domestic good, to see where you want to use, the environment is different from the choice of the camera is also different, the price gap is also great,

Q:Monitor the camera what is the zoom

Zoom, is the focal length, that is, long-term problem! Is to see the camera to the object far, closer. Change is to see the object to enlarge. Do you understand that?

Q:Monitor camera parameters how to see

Focal length (f): focal length is the distance between the lens and the photosensitive element, by changing the focal length of the lens, you can change the lens magnification, change the size of the captured image. When the distance between the object and the lens is very far, we can use the following formula: lens magnification ≈ focus / material distance. Increase the lens focal length, enlarge the magnification, can be closer to the vision, the scope of the screen is small, the details of the vision to see more clearly; if the lens to reduce the focal length, magnification reduced, the scope of the screen expanded, See the bigger scene.

Q:Install the monitor camera need to put a few lines

A fixed-focus camera requires two lines, one video cable (from the recorder to the camera), a power cord (from the recorder to the camera, or the nearest socket can also be).

Q:Elevator in the monitor camera lens focal length with the number

The smaller the number of millimeters, the greater the angle, see the closer .3.6 mm angle of about 75 degrees, the proposed monitoring distance of 5 meters .2.8 mm angle of about 90 degrees, the proposed monitoring distance of 3 meters

Q:What is the difference and connection between the optical zoom and the digital zoom of the camera in the security monitoring?

Digital zoom, the software is a way to achieve the realization of electronic amplification, and more for high-definition network camera, through the camera's capture screen, the screen to enlarge the local.

Q:The camera used to monitor the color of the screen is not normal. Blue as red. Red out is blue. New to buy the camera

It shows that the camera is not good, color cast, color reduction is not good

Q:Monitor the camera 1/3 and 1/4 of the difference there is nothing different CCD what is it

1/4 and 1/3 refer to the size of the camera's sensor chip. The camera image sensor (CCD or CMOS) has an area of 1/3 inch or 1/4 inch. The same manufacturing process and standards, the larger the image sensor (CCD or CMOS) area, the better the image quality (resolution).

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

2, although the surveillance camera access to the hard disk video recorder, but the video storage of the hard disk failure, can not playback.

Q:Surveillance video can only save 4 days (the original can save about 15 days), is not the hard disk video recorder is a problem?

You are not modified to save the format of the ~ !! You can choose to format the hard disk ~ !! Clear all the contents of the inside to see