What is the difference between four cameras and three cameras?

Take mobile phones as an example. The difference between three-camera and four-camera is:

1. As the name suggests, three-camera means three cameras, and four-camera means four cameras. Between the two The only difference is that the three-camera model has one less camera than the four-camera model.

2. Currently, several common camera types include ultra-wide cameras, wide-angle cameras, telephoto cameras, macro cameras, depth-of-field cameras, etc. The key is to see how to match them, such as the high-end flagship Apple 11 series, Samsung note10 series has three cameras, covering ultra-wide-angle, wide-angle, and telephoto solutions. Some mid-to-high-end models use a main camera + wide-angle + telephoto three-camera solution or a main camera + wide-angle + telephoto + depth-of-field four-camera solution. , some mid-to-low-end models may also adopt a three-camera solution of main camera + wide-angle + depth of field or a four-camera solution of main camera + wide-angle + macro + depth of field. It mainly depends on the positioning and price of each product.

3. The most unique one at present is Huawei mate30pro. It does not use the common four-camera solution, but adopts a dual 40 million four-camera solution, which adds a 40 million movie lens and a larger CMOS And the proportions are more suitable for video shooting. The equivalent focal length of this movie main camera is 18mm, which is equivalent to an ultra-wide lens. The significance of this lens is to strengthen the video capabilities and low-light shooting capabilities of the mobile phone, such as the 256x super slow-motion function.

Cameras can be divided into two categories: digital cameras and analog cameras. A digital camera can convert the analog video signal generated by the video capture device into a digital signal, and then store it in the computer. The video signal captured by the analog camera must be converted into a digital mode through a specific video capture card and compressed before it can be converted to a computer for use. Digital cameras can directly capture images and then transmit them to the computer through serial, parallel or USB interfaces. The cameras in the computer market are basically digital cameras, and the digital cameras are mainly USB digital cameras that use new data transmission interfaces. Most of the products on the market are of this kind.