In theory alone, in order to be able to image on the CCD surface, only a piece of lens is enough. However, in practical applications, due to the unique spherical aberration and chromatic aberration of the lens, the aberrations that affect the imaging quality exist,
In order to solve the image quality problem, lens combinations of different curvatures and different materials are used in the lens design to eliminate or reduce its impact. In addition, an aspheric lens method is also available. Aspheric lenses are very effective in removing spherical aberrations, reducing the number of lenses, and improving image quality.
With the development of prototype processing technology, plastic aspheric surfaces and glass aspheric surfaces are increasingly used in lenses.
The lens assembly of the camera can be composed of many independent polished glass elements or pressed by transparent plastic. Its function is to focus light on the photosensitive surface. The higher the quality of the lens assembly, the clearer the photos will be. The main function of the digital camera lens assembly is to converge the light onto the CCD or CMOS image sensor.
For fixed-focus cameras, the ideal distance between the lens, the object and the focal plane must be accurately calculated to fix the position of the lens assembly and the aperture.
For zoom cameras, there is a mechanism that moves the lens assembly forward or backward, keeping it in the center of the focus plane, allowing you to capture objects closer or farther from the lens.
Most digital cameras have a built-in focusing device that uses infrared autofocus. These cameras measure the time it takes for the beam to bounce back to the camera and calculate the distance between the camera and the object to move the lens assembly.
High-quality professional DSLR cameras use a wave autofocus system that reads out the image and compares the viewfinder
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