How to identify the camera?

In the surveillance camera, CCD trigger is the heart of the whole camera, which directly affects the imaging effect of the camera. There are domestic Sony, original Sony, Sharp, NVP, Hitachi and so on. In the choice of camera, the original Sony chip is selected.

2. lens

The lens is divided into small lens and CS lens (large lens). Small lenses are used in small hemispheres and small cameras, and the lens luminous flux is divided into F 1.2, F 1.4 and millions of high-definition lenses. When choosing a lens, choose a CS lens. A good lens will make the effect more realistic during the day and clearer at night.

3. Lamp board

The light panel is divided into ordinary infrared lights (Dingyuan, Guanglei) and array lights, and the array camera is also divided into 1 watt, 2 watts and 3 watts. So when choosing infrared, if it is an ordinary infrared lamp, try to choose Dingyuan and array 3 watts. Because we can't see the appearance of infrared light, some cameras in the cottage are charged by Guanglei given distance and array 65438+.

4. Maximum aperture

The real value of the maximum aperture is to increase the amount of light entering in weak light, so as to achieve the best exposure combination. Shooting scenery does not need the blur ability of the lens, except for particularly dark places, and it does not need the lens caliber. However, when a 70-200mm zoom lens is matched with a 2x zoom lens, so that the telephoto cross section becomes 400mm, and AF is used for autofocus, the lens with the largest aperture F2.8 is selected.

5, focal length

Wide-angle lens should be used to shoot scenery and telescope lens should be used to shoot people, so you should first decide the focal length of the lens you want to buy according to the purpose of photography.

6. Close-up ability

First of all, the close-up ability of a wide-angle lens has almost nothing to do with the wide-angle lens, but when shooting a flower scene with a vast landscape as the background, it is often necessary to shoot the flowers a little bigger. In similar circumstances, the close-up ability of a wide-angle lens is very important.

The close-up capability of the existing 50mm standard lens is about 1 125px, which basically meets the requirements. However, when the shortest shooting distance is used, the large-aperture standard lens often produces large aberration because of the lens protrusion, resulting in low imaging quality.

Step 7 show

When many people choose a lens, the first concern is the clarity of the lens. The purpose of the photo determines what kind of sharp lens is needed. High-priced high-quality lenses are mainly used by professional photographers. If it's just general photography, there's no need to buy expensive and high-quality lenses. In addition, the imaging clarity of the lens is directly related to the aperture size. When a lens is reduced by one or two steps from the maximum aperture, the imaging clarity will be greatly improved.

Extended data

For many consumers, the design style of the webcam, the computer type it matches and the overall color coordination with the desktop space can play a great guiding role in the final choice.

Well-known manufacturers will specially design webcams for notebook or desktop users to meet the needs of different computer users for overall desktop collocation. Some cameras are equipped with notebook adjustable positioning clips or desktop adjustable multifunctional bases.

For the camera itself, the lens is the decisive factor of imaging clarity. There are two kinds of lens materials: glass lens and plastic lens. Glass lenses have been used in relatively high-end products because of their great advantages in light transmittance and imaging effect.

In addition, the important index to judge the quality of glass lens is luminous flux, which is the most critical factor to determine the details and definition of camera sensor image acquisition. When choosing lenses for friends who pay attention to the quality of network cameras, the general principle is to choose lenses produced by well-known manufacturers.

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