Cctv And Security
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The monitoring camera has 3.6 mm and 3.2 mm. What is the difference?
- Surveillance camera lens mm number, generally 3.6 mm, 4mm, 6mm, 8mm, 12mm, you said 3.2 mm generally not, if have also special lenss
The above position is to use the 6mm to monitor the camera lens or the 8mm lens is suitable
- With 6 mm wide, this distance, with 6 mm is suitable for, 420 line and 480 line is a little difference, 480 is clear, but the definition and the relationship between the host, the largest and protective cover, is better, nanjing ZhiYu technology to do a lot of casess
How to select hd surveillance camera
- The priority is to select the brand of big factory, the brand relies on technology and word of mouth, which represents the development direction of hd camera technology. The price is a little more expensive than small manufacturers. "Only buy right don't buy expensive" is true, but can't buy cheap go to buy a few miscellaneous brand, the problem is a lot of problem in a short time, after sale service also is not in place. Surveillance cameras is not a day two days, good quality, durability is very important, and brand manufacturers order will on time, after-sales service in place, compatible system performance is good, these are to buy monitoring equipment should be considered clear.s
20 meters away with the number of mm monitor camera lens appropriate
- At the same time, the same focal length, length and width shooting range also with the camera CCD has a relationship. Charge - coupled Device, Charge - coupled Device. It is a semiconductor device that converts optical images into electrical signals. At present, most of the CCD chip used in the surveillance camera is 1/3 "and 1/4", that is, the target size is 1/3 inch and 1/4 inch. CCD target surface size, CCD and lens with the situation will directly affect the size of the field of view and image clarity.s
What is the number of millimeters that monitor the camera
- And then the zoom is generally wide angle is more than 90 degrees above the normal is about 30 degrees long focal length is less than 20 degreess
What are the monitoring lenses?
- Lens by focal length, can be divided into: standard lens, wide-angle lens, fisheye lens, long focal length lens, reflective telescope lens, macro lens.s
What is the difference between the 2.4mm, 4mm and 6mm camera lens?
- The 4MM is best to look at the area of about 4 meters, and so on. The approximate distance is like thiss
What is zoom in the surveillance camera
- The lens corresponds to the lens of the human eye. Without the lens, the human eye can't see anything. If there is no camera, the image output from the camera is white, and there is no clear image output, which is consistent with the principle of our home camera and camera. When the muscle of the human eye cannot stretch the lens to its normal position, it is the nearsightedness that is often said, and the scene becomes blurred. With the camera and lens has a similar phenomenon, when the images are not clear, can adjust the camera focus after, change the distance between CCD chip and lens datum (equivalent to adjust the position of the eye lens), can be blurred image becomes clear. Thus it can be seen that the camera's role in CCTV is very important. Engineering design and construction personnel are often dealing with lens: design personnel shall be calculated according to the object distance, and the size of the imaging lens focal length, construction personnel on-site commissioning, often is one part of the lens to adjust to the best state.s
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