Traditional Culture Encyclopedia - Photography and portraiture - How to use a mini camera?
How to use a mini camera?
There are many kinds of cameras and waterproof digital cameras, and the basic principle is the same: converting optical image signals into electrical signals for storage or transmission. When we shoot an object, the light reflected by the object is collected by the camera lens and focused on the light receiving surface of the camera device (such as the target surface of the camera tube), and then the light is converted into electric energy by the camera device, and the video signal is obtained. The photoelectric signal is very weak, so it needs to be amplified by pre-amplifier circuit and then processed and adjusted by various circuits. The final standard signal can be sent to video recorders and other recording media for recording, or spread through a propagation system, or sent to a monitor for display.
Signal Noise Ratio (SNR)
It is the ratio of video signal level to noise level. This indicator is an important indicator to measure the quality of the camera. The higher the signal-to-noise ratio, the clearer the image and the higher the quality, usually above 50dB.
sensitive
The sensitivity is that the light with a color temperature of 32000K and an illumination of 2000LUX shines on the gray card with a reflection coefficient of 89-90% and is photographed by the camera. When the image level reaches the specified value, the greater the required aperture index f and f, the higher the sensitivity.
minimum illumination
The camera needs to work under the light condition with a certain brightness (illumination). If the light is lower than a certain illumination, the image can't be seen clearly.
Rayleigh criterion of resonance limit
Generally, it is expressed by definition, that is, the number of TV lines that can be distinguished on the screen, which is divided into horizontal definition and vertical definition. The index gives the clarity of the central part.
1, protect the LCD screen, and the LCD screen of a digital camera may stick with some fingerprints or dirt that is not easy to erase during use. Besides wiping with a soft cloth, you can also stick a transparent protective film to prevent the screen from being scratched more effectively.
2. Photographers should pay attention to the connection between the cable and the video recorder when grabbing the lens, never run away with the machine, and ignore that the cable is still connected to the video recorder to prevent the cable from breaking the connection in the video recorder or camera cable due to excessive force.
The camera should be protected from the rain. Avoid using the camera in damp, high temperature, places where sharp objects scratch the lens, there is much dust and strong magnetic field. These factors will cause great damage to the camera or cause machine failure.
4. Because most cameras use camera tubes, long-term exposure to light or strong reflection may burn out the camera tubes. When the camera is in use, it can't face the light and the sun, let alone focus on them. This kind of loss should be avoided.
The above is the introduction of mini camera. Ordinary cameras have many parts and big parts. If you have a fixed place to go out, it's not too hard to use. However, if we need to keep walking and moving, the camera will have an impact, and the mini camera can make it easier and more convenient for us to take pictures wherever we go.
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